Initial states of Thailand
Before the southward migration of the Tai from Guangxi beginning in the 4th century, the Indochinese peninsula was already inhabited by Austronesians, who had spread into all subregions by approximately 30,000 BP. These populations left evidence of an early local culture known as the Hoabinhian, a term applied to a lithic industry and long-term cultural tradition characterised by stone tools and flaked cobble artefacts, which emerged around 10,000 BP in caves and rock shelters. First identified at sites in Hòa Bình, Vietnam, the Hoabinhian was later documented in Terengganu, Malaysia, Sumatra, Thailand, Laos, Myanmar, Cambodia, and Yunnan, southern China.
Source: Wikipedia — Initial states of Thailand (CC BY-SA 4.0)