Prehistoric occupation and burial sites in the mountains of the Nam Khong area, Mae Hong Son Province, Northwestern Thailand.

Thirty-one previously unreported prehistoric sites are described from karst locations in the mountainous Mae Hong Son province of far northwestern Thailand. These sites variously contain stone tools, ceramics, bronze and iron artefacts, food refuse, a wood carving and, most conspicuously, large wooden coffins with some human remains. The earliest sites contain typically Hoabinhian assemblages while most recent may relate to Lawa' occupation prior to the advent of Shan peoples in the area ~ 0.8 ka BP.