TENAS′SERIM. The southernmost division of Lower Burma (see Burma), bordering on Siam, and comprising the districts of Salwin, Amherst, Tavoy, Thaton, Toungu, and Mergui (Map: Burma, C 4). Tenasserim is a narrow strip of coast about 500 miles long, with a varying breadth of from 40 to 80 miles, extending from the Pakchan River northward to the Salwin. Area, 36,086 square miles. Population, in 1891, 912,051; in 1901, 1,137,776. The chief town is Maulmain.