| Mutsu Bay | |
|---|---|
.png) A map of Mutsu Bay and its surroundings | |
  Mutsu Bay | |
| Location | Aomori Prefecture, Japan |
| Coordinates | 40°59′N 140°58′E / 40.983°N 140.967°E |
| Ocean/sea sources | Pacific Ocean |
| Basin countries | Japan |
| Max. length | 40 km (24.85 mi) |
| Max. width | 40 km (24.85 mi) |
| Surface area | 1,668 km2 (644 sq mi) |
| Average depth | 40 m (130 ft) |
| Settlements | Aomori, Mutsu |
Mutsu Bay (陸奥湾, Mutsu-wan) is a bay located within Aomori Prefecture, in the northern Tōhoku region of northern Japan. It has an east-west distance of approximately 40 kilometers (22 nmi; 25 mi) and a north-south distance of approximately 40 kilometers (22 nmi; 25 mi) at its eastern end, with a total area of approximately 1,667.89 square kilometers (486.28 sq nmi; 643.98 sq mi).