Tanintharyi Region
Tanintharyi Region historically included the entire Tanintharyi salient—today's Tanintharyi Region, Mon State and southern Kayin State. The northernmost region was part of the Thaton Kingdom before 1057, and the entire coastline became part of King Anawrahta's Pagan Empire after 1057. After the fall of Bagan in 1287, the area fell to the Siamese kingdom of Sukhothai, and later its successor Ayutthaya Kingdom. The region's northernmost border was around the Thanlwin (Salween) river near today's Mawlamyaine (Moulmein).