The Fitzwilliam Strait ( 76°30′N116°0′W / 76.500°N 116.000°W ) is a natural waterway through the central Canadian Arctic Archipelago in the Northwest Territories of Canada. [1] It separates Prince Patrick Island (to the north-west), Melville Island (to the south-east) and Emerald Isle (to the north-east). It opens into the Kellett Strait to the south-west.