Port Phillip, sometimes referred to as Port Phillip Bay, is a large bay in southern Victoria, Australia, 1,930 km² (476,900 acres) in area, with a coastline length of 264 km (164 mi). The bay is extremely shallow for its size, but mostly navigable. The deepest portion is only 24 m (80 ft), and half the region is shallower than 8 m. Its volume is around 25 km³. The city of Melbourne is located at its northern end, near the mouth of the Yarra River.