Prince Regent Inlet is a body of water in Nunavut, Canada between the west end of Baffin Island and Somerset Island on the west. It opens north into Lancaster Sound and to the south merges into the Gulf of Boothia. This passage marks an area rich in marine and avian life. Thick-billed murres, ivory gulls, beluga, narwhal, and bowhead whales reside in the ice-strewn waters.