A limestone massif with a number of caves which have produced material of all periods from Palaeolithic to c 1300 AD in Sarawak, north Borneo. It is one of the major prehistoric deposits of island Southeast Asia with human remains. The most important site, the Great Cave, has deposits which may be of Middle Palaeolithic age, but a later stratum (dated around 38,000 BC) yielded a Homo sapiens skull which is probably the oldest yet known in the region. Other deposits include a series of flexed, seated, and fragmentary burials dated to 12,000-1500 BC and extended burials in wooden coffins or mats of the last two millennia BC. There are also jar burials and cremations from c 1500 BC to 1000 AD. There was distinctive pottery c 2500 BC, Neolithic polished stone adzes, and metal by the 1st millennium AD.