The city is situated 528 kilometres (328 miles) southwest of the capital Mogadishu, near the mouth of the Jubba River, where it empties into the Indian Ocean.

The city is situated 528 kilometres (328 miles) southwest of the capital Mogadishu, near the mouth of the Jubba River, where it empties into the Indian Ocean. According to the United Nations Development Programme, the city of Kismayo had a population of around 89,333 in 2005.

During the Middle Ages, Kismayo and its surrounding area was part of the Ajuran Empire that governed much of southern Somalia and eastern Ethiopia, with its domain extending from Hafun in the north, to Qelafo in the west, to Kismayo in the south.