FOCA, a town of Bosnia, Yugoslavia. Pop. (1931) 4,613. It is famous for its silver filigree work and inlaid weapons. The soil produces excellent walnuts, but poor tobacco. Lying close to the frontiers of Novipazar and Montenegro, Foca (Chocha) was the scene of almost incessant border warfare during the middle ages. No monuments of this period are left, except the Bogomil cemeteries and the beautiful mosques, which are the most ancient in Bosnia. Foca was a trading station of the Ragusans in the i4th century, if not earlier. In the 16th century it was the residence of the governor of Hercegovina. It was captured by the Montenegrins in the World War.