| Official Name: | Basse Santa Su |
| Pushpin Map: | Gambia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in the Gambia |
| Subdivision Type: | Country |
| Subdivision Name: | The Gambia |
| Subdivision Name1: | Upper River Division |
| Subdivision Type2: | District |
| Subdivision Name2: | Fulladu East |
| Unit Pref: | Imperial |
| Population Total: | 18,414 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | GMT |
| Utc Offset: | +0 |
| Coordinates: | 13.3167°N -27°W |
Basse Santa Su, usually known as Basse, is a town in the Gambia, lying on the south bank of the River Gambia. The easternmost major town in the nation, it known for its important market. Basse is the capital of the Upper River Division, which is coterminous with the Basse Local Government Area. As of 2009, the town has an estimated population of 18,414.[1] According to the 2013 census, the Basse LGA has 243,791 residents.[2]
According to oral histories, the first Mandinka immigrants to the Gambia area, the Fati clan, settled in Tumana near Basse. They subsequently acted as hosts and/or agents for future migrants, potentially including Tiramakhan Traore. Basse was at this point a hub in regional trade networks bringing kola nuts and Guinea pepper north from what is now Guinea-Bissau and salt and salted fish up the river from the coast.[3]
A bridge over the Gambia river, funded by the Chinese government, opened in October 2021.[4]
Basse Santa Su has a tropical savanna climate (Köppen Aw), almost dry enough to be a hot semi-arid climate (BSh) with almost no rainfall from November to May and heavy rainfall from June to October.