The river highways bring down inexhaustible supplies of rice to Moulmein, the chief town of the district, as also of the province of Tenasserim.
The third natural division of Burma is the old province of Tenasserim, which, constituted in 1826 with Moulmein as its capital, formed the nucleus from which the British supremacy throughout Burma has grown.
Huge caves, of which the most noted are the Farm Caves, occur in the hills near Moulmein, and they too are full of relics of their ancient use as temples, though now they are chiefly visited in connexion with the bats, whose flight viewed from a distance, as they issue from the caves, resembles a cloud of smoke.
The Gyaing and the Attaran rivers meet the Salween at its mouth, and the three rivers form the harbour of Moulmein, the second seaport of Burma.
The volunteer forces consist of the Rangoon Port Defence Volunteers, comprising artillery, naval, and engineer corps, the Moulmein artillery, the Moulmein, Rangoon, Railway and Upper Burma rifles.