Nuup Kangerlua is a 160 km (99.4 mi) long fjord in the Sermersooq municipality in southwestern Greenland. It was formerly known as Gilbert Sound and Baal's River. It is the longest fjord on the Labrador Sea coast of Greenland, and one of the longest in the inhabited part of the country. From its position beside the island's capital, it was formerly known as Godthaab Fjord.
Nuuk, the capital of Greenland, is located near the mouth of the fjord, on a mountainous peninsula bounding the fjord from the southeast. Kapisillit is located 75 km (47 mi) northeast of Nuuk, near the head of Kapisillit Kangerluaq, one of the tributary fjords of Nuup Kangerlua.