The district covers an area of 4363.48 km2 , with several small valleys between high forests . The temperature ranges from 12 to 33 °C , and the annual rainfall averages 2,174 mm . It is at the foot of Garo hills of Meghalaya , and includes some '' chars '' ( sandy islands ) founded on the bed of the Old Brahmaputra River and also some ancient forests of mainly a single wood tree , the sal tree . The city of Mymensingh stands on the bank of the Old Brahmaputra , as the 1897 Assam earthquake changed the main flow from Brahmaputra to the Jamuna River which flows west of the greater Mymensingh region . After about hundred years , a port city of sea vessels from England lost its status as the river became a seasonal flow . Some former residences of colonial officials along the side of the river in the city are nowadays government buildings . The area of Greater Mymensingh , the north front line is just at the foot of Garo hills of Meghalaya of India , the south this area excludes The Gazipur District , the east ends in the rich watery land of Bangladesh as native calls ' Hawor ' , the west ends in the ancient single wood forest ( e.g. Muktagacha , Fulbaria and Valuka upazilas ) and the Chars of Jamalpur District sided north-west of Mymensingh district
1897 Assam earthquake
1897 Assam earthquake
Mymensingh District