Morrissey Harbour is located on the north shore of Mill Island in Hudson Strait, Nunavut. It is an excellent natural harbour, though it is not named on official charts. The harbour is situated in the middle of the island's north coast, an area characterized by remarkable terraces rising abruptly from the sea. The main entrance to the harbour is deep, but strong tidal streams and whirlpools exist close outside the entrance. These tidal streams run with great strength between Mill Island and the Baffin Island coast to the north, and a steep, heavy sea can develop when this current is opposed by the wind. This makes timing entry and exit with tidal conditions critical for paddlers. Within the harbour, anchorage has been found in the southeast part in 7 fathoms (approximately 12.8 meters) over a mud bottom. There is also anchorage at the north end of the channel between Putnam and Mill Islands, though the only approach to this spot is from the northeast. The surrounding islands are barren. The historical account from 1927 notes that the harbour provided safe anchorage for the 112-foot schooner Morrissey, for which it is named.