Garissa is a city in the North Eastern Province
. It is the capital of both the province and Garissa District.
Garissa has a population of 65,881 inhabitants (1999 census). The Tana River flows through the city.
Most of the town's inhabitants are ethnic Somalis and pastoralists. These are further sub-divided into clans, with the Ogaden sub-clan of the Somali Darod especially well-represented. There are also a small number of other minority ethnic groups, commonly referred to as corner tribes.
Garissa's landscape is mostly arid, desert terrain.The city lies along the Tana River, and has a very warm/hot climate due to the low elevation and distance away from the cooler coastal areas. The daytime temperature typically rises above 33°C (91°F), every day, but returns to a mild temperature, every night.