Archaeological surveys have actually so far unearthed 12 walled cities, including five large walled cities, and several smaller non-fortified settlements, located at or near the three most important irrigated regions of precolonial Burma: the Mu River Valley in the north, the Kyaukse plains in centre, and the Minbu region in the south and west of the former two.Aung-Thwin 2005: 18–19 The city-states were contemporaries of the Kingdom of Funan (Cambodia) and (perhaps) Champa (southern Vietnam), Dvaravati (Thailand), Tambralinga and Takuapa near the Kra Isthmus, and Srivijaya (southeast Sumatra). All these statelets foreshadowed the rise of the "classical kingdoms" of Southeast Asia in the second millennium CE.Aung-Thwin 2005: 25–26
