It stretches along both sides of the Irrawaddy from the north of Mandalay to Thayetmyo, and embraces the Lower Chindwin, Shwebo, Sagaing, Mandalay, Kyaukse, Meiktila, Yamethin, Myingyan, Magwe, Pakokku and Minbu districts.
South of Thayetmyo, where arms of the Arakan Yomas approach the river and almost meet that spur of the Pegu Yomas which formed till 1886 the northern boundary of British Burma, the valley of the Irrawaddy opens out again, and at Yegin Mingyi near Myanaung the influence of the tide is first felt, and the delta may be said to begin.
Coal is found in the Thayetmyo, Upper Chindwin and Shwebo districts, and in the Shan States; it also occurs in Mergui, but the deposits which have been so far discovered have been either of inferior quality or too far from their market to be worked to advantage.
Cutch-boiling forms the chief means of livelihood of a large number of the poorer classes in the Prome and Thayetmyo districts of Lower Burma, and a subsidiary means of subsistence elsewhere.
THAYETMYO, a town and district in the Minbu division of Upper Burma.
The chief river is the Irrawaddy, which traverses Thayetmyo from north to south.
On the annexation of Pegu by the British in 1852-53, Thayetmyo was formed into a subdivision of Prome district; and in 1870 it was erected into a separate jurisdiction and placed under a deputy-commissioner.