The Tharrawaddy district, lying between 17° 31´ and 18° 47´ North Latitude and between 95° 15´ and 96° 10´ East Longitude and having an area of 2,863 square miles, forms part of the Pegu Division of Lower Burma. It marches with the Prome district on the north and with the Insein district on the south. To the east the range of hills known as the Pegu Yoma, reaching in places a height of 2,000 feet, divides it from the Pegu and Toungoo districts. The western boundary is the Irrawaddy River, but in the south-west a small area between that river and the Insein district is excluded, to belong to the district of Henzada.