Before the Tai people's southward migration from Guangxi since the 4th century, the Indochinese peninsula had already been populated by Australo-Melanesians who by around 30,000 BP had spread into all sub-regions. They left traces of the first local culture - the Hoabinhian, a name assigned to an industry and cultural continuity of stone tools and flaked cobble artifacts that appears around 10,000 BP in caves and rock shelters first described in Hòa Bình, Vietnam, later also documented in Terengganu, Malaysia, Sumatra, Thailand, Laos, Myanmar, Cambodia and Yunnan, southern China.