| Karsa | |
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 Pliocene columnar basalt at Karsa watering hole, in Turkana, Kenya. | |
| Location | Marsabit, Turkana County, Kenya |
  Location of Karsa in Kenya | |
| Coordinates | 03°10′38″N 36°32′33″E / 3.17722°N 36.54250°E |
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Karsa is a basalt geological formation, archaeological site, and watering hole in Turkana County, Kenya, on the southeast margin of Lake Turkana. Karsa volcanic flows lie at the base of important sedimentary formations in the Turkana Basin and are an example of columnar jointed basalt.