The Chochenyo (also called Chocheño, Chocenyo) are one of the divisions of the indigenous Ohlone (Costanoan) people of Northern California. The Chochenyo resided on the east side of the San Francisco Bay (the "East Bay"), primarily in what is now Alameda County, and also Contra Costa County, from the Berkeley Hills inland to the western Diablo Range. Chochenyo territory was bordered by the Karkin to the north (at Mount Diablo), the Tamyen to the south and southwest, the San Francisco Bay to the west, and overlapped a bit with the Bay Miwok and Yokuts to the east.