The Shan–Thai or Sibumasu terrane was a microcontinent which extended from Lhasa (Tibet) West Yunnan, Myanmar, West Thailand, much of Malaysia and Sumatra. It was an archipelago with landmasses which shared a similar geological history. The Shan–Thai terrane rifted from Australian plate part of Gondwana in the Permian. It collided with the Indochina and South China terranes almost simultaneously in the Middle Triassic.