• Can inscriptions help reconstruct how a kingdom expanded across a landscape?

King Citrasena (Chitrasen, later known as Mahendravarman) ruled Chenla in the late 6th to early 7th centuries, during a period when Chenla’s influence was extending across parts of what are now Cambodia, Laos and northeastern Thailand. His reign is known partly through inscriptions recording religious foundations, royal achievements and other acts of authority. 

Pailoplee and Khatshima map 21 inscriptions from at least 19 locations associated with Citrasena, and asked if people were moving between these places, which routes would they have taken? To explore this, they use Least Cost Path (LCP) modelling in a GIS. LCP calculates routes that minimise the “cost” of movement across terrain.

In archaeology, this can help identify plausible corridors shaped by features such as slopes, river valleys and mountain barriers. These models show how movement could have been structured by the landscape under the assumptions of the model.

Across several scenarios, the reconstructed paths repeatedly concentrate around major river systems—especially the Mun River—and particular passes through the Phnom Dong Rek (Dangrek) mountain range. The authors also compare the modelled network with archaeological sites attributed to Citrasena’s period, many of which fall along these reconstructed corridors.

Where river navigation would have been difficult (such as the Khone Phapheng Falls), the authors propose that Citrasena’s forces may instead have moved overland along riverbanks, using waterways as natural guides through the landscape.

The placement of several inscriptions near river confluences also suggests that these locations may have been important for controlling movement, communication and exchange, not simply access to water.

Reference
Pailoplee, S. & Khatshima, K. 2026. “The role of King Chitrasen (Mahendravarman) in the expansion of the Chenla Kingdom: A study of inscriptions and historical geography.” Social Sciences & Humanities Open 14, 103503.
10.1016/j.ssaho.2026.103503

#SoutheastAsianArchaeology #Cambodia #Thailand #Laos #Chenla
  • Sometimes the biggest archaeological questions depend on evidence we cannot see during excavation.

Microarchaeology investigates archaeological deposits at microscopic and microstratigraphic scales. In Southeast Asia, this can be especially valuable because monsoonal wetness, tropical weathering, intensive land use and complex depositional histories can affect how archaeological evidence survives. 

Researchers can examine the surrounding sediment for traces of past activity and later disturbance. Methods discussed in this new paper include sediment micromorphology, laboratory micro-excavation, high-resolution imaging, FTIR microscopy and SEM-EDS. Depending on the context, microscopic evidence can help identify burning, trampling, plant processing, sediment movement and environmental change. 

The importance of that context is illustrated by work in northern Laos. At Tam Ngu Hao 2, microstratigraphy was used alongside lithological observations and dating to establish the stratigraphic context of Denisovan fossil evidence. At Tam Pà Ling, it has shown potential for investigating environmental seasonality and possible patterns of early modern human presence. These methods help archaeologists understand what happened to a deposit before drawing conclusions from what it contains.
 
The paper also introduces the Australian Microarchaeology and Palaeosciences Facility (AusMAP) and argues for greater collaboration, training and locally based microarchaeological expertise across Southeast Asia. 

Reference:
Hernandez et al. 2026. Scaling down to look further back: Southeast Asia, deep-time science and microarchaeology. SPAFA Journal 10.
10.26721/spafajournal.651369a4y8 

#SoutheastAsianArchaeology #Archaeology #Microarchaeology #Geoarchaeology #ArchaeologicalScience
  • This week on Southeast Asian Archaeology: claims, contexts and careful reading.⠀
⠀
With Malaysia’s National Day, Vietnam’s National Day, Timor-Leste’s Popular Consultation Day, and International Literacy Day all close together, I’m thinking about literacy not just as reading words, but reading evidence: museum labels, old spellings, dates, maps, artefacts, archives, and the occasional viral post with a raised eyebrow.⠀
⠀
The catalyst this week is the recent controversy over historical claims in Malaysia, alongside a timely RSIS piece on how historians, archaeologists, archivists, librarians and curators can help push back against disinformation. Not by attacking people, but by helping everyone ask better questions of the past.⠀
⠀
Also in this week’s issue: Penang’s historical Malay spellings, Cambodia’s new artefact database grant, Singapore’s revised History Gallery, UNESCO’s maritime museum project, new research on Sundadonty, Roti Island, Chenla inscriptions, ancient Myanmar, and more.⠀
⠀
Link in bio.⠀
⠀
#SoutheastAsianArchaeology #Archaeology #Heritage #InformationLiteracy
  • How old are the rock paintings of Mainland Southeast Asia? 🎨🪨

A new study from Mangguan in Yunnan, southwestern China, provides another important piece of the puzzle.

Using uranium-thorium dating, researchers analysed tiny calcite deposits that had formed over the paintings. Because the calcite must be younger than the pigment underneath, the dates provide a minimum age for the art. One deposit covering a human figure shows that the painting was already there at least 4,220 years ago.

Mangguan is particularly interesting because it lies only about 15 km from the better-known Cangyuan rock art complex. The two have stylistic similarities and overlapping dates, suggesting they formed part of a broader regional rock art tradition, a comparison can be taken farther south.

The rock paintings at Pha Taem in Luang Prabang, Laos, have previously been compared with Cangyuan, raising intriguing questions about relationships between the rock art traditions of southwestern China and Mainland Southeast Asia.

Most rock art in Mainland Southeast Asia remains poorly dated, so dates like those from Mangguan give us increasingly useful chronological anchors for thinking about these connections.

References:
Wu, Y. et al. 2026. U-Th dating of rock paintings in southwestern China: minimum age of ~4.2 ka BP at the Mangguan site. Journal of Archaeological Science: Reports 74, 105987. DOI: 10.1016/j.jasrep.2026.105987.

Bo, X. 2020. On the relationship between the Cangyuan rock art in Yunnan, China, and the Pha Taem rock art in Laos. Rock Art Research 37(2).

Tan, N.H. 2018. The Cliff Paintings of Pha Taem, Luang Prabang, Lao PDR. Rock Art Research 35(1).

#RockArt #SoutheastAsianArchaeology #Yunnan #China
  • Extraordinary claims about the past can be exciting. But how do we tell an exciting new hypothesis from pseudoarchaeology?

Recent controversy in Malaysia over claims that ancient Malays taught the Romans shipbuilding provides a useful case study. Rather than piling on the person behind the claims, I think there is a more useful question to ask: how would we actually test an idea like this?

Archaeology gives us some simple tools.

Do the dates work? What is the primary evidence? Does the evidence actually demonstrate the connection being claimed? Are there better explanations? And perhaps most importantly: what evidence would make us reject the hypothesis?

Ancient Southeast Asians really were sophisticated seafarers. Srivijaya really was one of Asia’s great maritime powers. Sungai Batu really does preserve remarkable evidence for early iron production.

None of those achievements needs embellishment to make Southeast Asian archaeology extraordinary.

Swipe through for five questions you can use the next time you encounter an astonishing claim about the ancient past.

🚩 Remember: possibility is not evidence, similarity does not necessarily mean transmission, and extraordinary claims still have to survive ordinary archaeological scrutiny.

Read more about the archaeology behind these claims in this week’s Southeast Asian Archaeology Newsletter.

#SoutheastAsianArchaeology #Pseudoarchaeology #Malaysia #MaritimeArchaeology #MediaLiteracy
  • A 4,000-year-old painted stone from Wetar Island may change how we understand the Austronesian story.⠀
⠀
Archaeologists excavating Huknaur 1 in Southeast Indonesia found a painted plaque with a red sun-ray motif linked to the Austronesian Painting Tradition — a wider visual tradition known from eastern Indonesia and nearby islands.⠀
⠀
What makes this find so important is that the plaque appears to be older than the first pottery at the site. That means a shared symbolic tradition may have been present before the full Neolithic package usually associated with Austronesian expansion. This discovery suggests that ideas, symbols, and identity may have travelled ahead of pottery.⠀
⠀
It is a reminder that the spread of people goes beyond tools, crops, or ceramics, and may also have been about belief, belonging, and a shared visual language carried across the sea.⠀
⠀
Swipe through to see why this small object has such big implications.⠀
⠀
Reference:⠀
O’Connor, S., Kealy, S., Kaharudin, H.A.F., et al. (2026). 4000-year-old painted plaque from Southeast Indonesia reveals Austronesian Painting Tradition preceded Neolithic pottery. PNAS 123(34): e2611580123.⠀
⠀
#SoutheastAsianArchaeology #RockArt #Austronesian #Indonesia #Wetar #SoutheastAsia #IslandSoutheastAsia #AustronesianPaintingTradition
  • Plaques, Ponds and Provenance⠀
⠀
This week’s newsletter begins with a 4,000-year-old painted plaque from Wetar Island — a small object with a big story.⠀
⠀
The plaque carries a red sun-like motif linked to the Austronesian Painting Tradition, and it appears before pottery at the site. That suggests visual symbols and shared ideas may have moved through maritime Southeast Asia before some of the usual archaeological markers we associate with Austronesian expansion.⠀
⠀
Also this week: archaeology beneath Angkor’s Sras Srang, suspected Ban Chiang artefacts offered for return from Switzerland, and more heritage news from across the region.⠀
⠀
Link in bio.
  • How do you make a 3-metre stone stand upright for centuries?

At Hintang in northern Laos, archaeologists are beginning to answer that question.

In 2025, a Lao-Australian team excavated Site 7A — the first excavation at a Hintang standing-stone site in around 90 years. Beneath the surface, they found that the stones had been set deeply into pits, with smaller rocks packed around their bases to stabilise them. Roughly one-third of each standing stone was buried underground.

One big question remains, though — how old are the Hintang stones?

Samples were collected for dating, but those results are still being analysed. So, for now, we understand a little more about how these monuments were built.

📖 Shewan, L., O’Reilly, D., Armstrong, B. & Butphachit, A. (2026). “Surveys of Hintang standing stone sites and excavations at Site 7A, Houaphanh, Lao PDR.” Antiquity.
doi: 10.15184/aqy.2026.10408

#Archaeology #SoutheastAsianArchaeology #Laos #Megaliths #Hintang #AncientTechnology #ArchaeologicalResearch #Heritage #NewResearch
  • Angkor’s water system is famous for its scale: enormous reservoirs, long canals, and monumental engineering.⠀
⠀
New research by archaeologist Sarah Klassen highlights how Angkor’s agricultural system also depended on more than 1,000 local temple communities spread across the Greater Angkor Region. These communities helped organise labour, manage local water systems, and coordinate rice production - and suggests that Angkor’s success was built through a combination of top-down and bottom-up management.⠀
⠀
The state created the large hydraulic framework. Local communities adapted to it, expanded around it, and helped make the wider agricultural landscape function.⠀
⠀
Over time, however, this balance changed. Land and resources became increasingly concentrated, the system became more centralised, and some of the flexibility that had helped Angkor cope with earlier environmental stress may have been lost.⠀
⠀
Beyond its temples and kings, Angkor
  • New Evidence from the Southeast Asian Borderlands⠀
⠀
This week in Southeast Asian Archaeology: new dates, new methods, and some wonderfully untidy timelines.⠀
⠀
🪨 Uranium-thorium dating pushes the Mangguan rock paintings in Yunnan back to at least 4,220 years ago⠀
 🥁 AI-assisted restoration takes on damaged imagery on Guangxi bronze drums⠀
 🌾 New work at Angkor asks how infrastructure, local communities and water management shaped resilience⠀
 🗿 Lao-Australian fieldwork maps and excavates the enigmatic Hintang standing stones⠀
⠀
Plus archaeology and heritage news from across Southeast Asia, new research, opportunities, and more.⠀
⠀
I’ve also started experimenting with short visual explainers of new archaeology papers here on Instagram — so follow along if you like your archaeology with fewer footnotes and more pixels.⠀
⠀
Read the latest SEAArch newsletter via the link in bio.⠀
⠀
#Archaeology #SoutheastAsianArchaeology #SoutheastAsia #RockArt #Angkor #Laos #Yunnan #Heritage #ArchaeologicalResearch #DigitalHeritage
Sunday, September 6, 2026
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Thai community archaeology project boosted thanks to grant

6 March 2008
in Thailand
Tags: Ban Rai (site)Community Archaeology / Public ArchaeologyHmong (people)Mae Hong Son (province)muralRasmi Shoocongdej (person)rock artsustainabilityTham Lod (Mae Hong Song)
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Pang Ma Pha district, in the Mae Hong Son province of Thailand is benefiting from a grant by the US government to support an archaeological research project focusing on the local caves. The project is run by Dr. Rasmi Shoocongdej from Silpakorn University.

I heard Dr. Shoocongdej presenting her Mae Hong Son work at a conference last year. Unlike most archaeological projects, this one really involved the community in managing the site, to the extent of teaching school kids about the prehistory of the region, as well as training guides within the community to help boost local tourism work. It’s a fine example of community archaeology.


photo credit: Michael Scalet

Preserving the Past
Bangkok Post, 04 March 2008
Link is no longer available

Preserving the Past

A research grant from the US government has helped sustain the Banrai archaeological site and the Tham Lod rock shelters in Mae Hong Son’s Pang Ma Pha district, which were at risk from mismanagement, poor conservation and unsustainable tourism.

In Oct 2006, then US ambassador Ralph Boyce handed over a 1.3-million-baht grant to chief researcher Rasmi Shoocongdej from the Faculty of Archaeology, Silpakorn University, to support a research project on the pre-historic site under the supervision of the Fine Arts Department.

The grant was made under the Ambassador’s Fund for Cultural Preservation, established by the US Congress in 2001, and enables American ambassadors to support the efforts of host countries to rescue cultural heritage sites thought to be in danger of destruction.

Kenneth Foster, first secretary and cultural attache at the US embassy, said it is important that exploration and excavation activities at the archaeological heritage site be allowed to continue, as they would help shed light on the mystery of Banrai and the Tham Lod rock shelters.

Also, it is necessary to preserve national treasures, which are being threatened by unsustainable tourism practices and poor management, said the envoy at the recent opening of an exhibition on archaeological heritage management at the site.

Pang Ma Pha district chief Suchart Teekasuk believes that to properly manage the site, community assistance also has a vital role to play.

Assoc Prof Rasmi said the local community and the National Park, Wildlife and Plant Conservation Department would cooperate in their efforts to conserve the two places.

He said the Banrai archaeological site and the rock shelters date back nearly 10,000 years. A male skeleton, thought to be from the Stone Age and more than 9,000 years old, was also discovered at the site.

There is also a large, ancient teak coffin dating back more than 2,600 years and thought to contain the remains of an important person.

However, Assoc Prof Rasmi is concerned over the possibility of over-exploitation of the archaeological site to promote tourism.

In his opinion, the site should be turned into a community museum to serve as a “natural laboratory” for ecological, ethnic and cultural research.

The archaeological site and the rock shelters are also rich in rock paintings.

Pang Ma Pha is home to various ethic groups such as the Shan, Karen, Lahu, Lisu, Hmong and Lua.

The project is aimed at helping the minority groups develop sustainable tourism in order to minimise the risk of damage to the rock shelters.

A history of aid
The Ambassador’s Fund for Cultural Preservation was established by the US Congress in 2001. It allows American envoys to support efforts in their host countries to rescue cultural heritage sites that are fragile and in danger of being lost forever. Each year since its inception, the fund has helped preserve Thailand’s cultural heritage.

In the first year, it supported Kamthieng House at the Siam Society in Bangkok’s Asoke area. In 2002, the Antique Textile Collections at the National Museum in Bangkok received assistance. In 2003, the fund contributed to the preservation of traditional Thai textile patterns and weaving techniques at the Golden Jubilee Royal Goldsmith College at the Grand Palace.

In 2004, the fund supported the creation of a digital archive of Thai-Muslim architecture in the South.

Last year, the fund turned north to preserve the murals at Wat Bann Koh, in Lampang province, with a grant of more than two million baht. This past year 1.3 million baht was used to preserve the archaeological heritage of the prehistoric Banrai and Tham Lod rock shelters.

Related books:
– Caves of Northern Thailand by P. Sidisunthorn, S. Gardner and D. Smart

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