Kvichak Bay is an arm on the northeast side of Bristol Bay in southern Alaska, at 58°26′N 157°54′W / 58.433°N 157.900°W. It is 80 km (50 mi) long and 48 km (30 mi) wide. The Kvichak River flows into the bay at its furthest northeast point, while the Naknek River comes in from the east about 16 km (9.9 mi) to the south of the Kvichak.