The Querimba Archipelago consists of 32 coral islands stretching from Pemba (the capital of Cabo Delgado Province) to the Rovuma River which forms the natural frontier between Tanzania and Mozambique. The area has never been developed and remains an unexplored tourist paradise. Quilálea Marine Sanctuary, consisting of Quilálea and Sencar Islands, lies 55 kilometres north of Pemba.
Quilálea Island (South 12.30'.00 East 40.35'.00) is 35 hectares in extent and is unique having a deep channel on the landward side, allowing protected mooring all year long and at all points of the tide. There are various beaches around the island. Seashells abound due to the high bio diversity of the inter tidal zone.

Sencar Island is 75 hectares in extent. It is O-shaped, with a coral rag exterior and a mangrove swamp interior. Water rushes in through a twisting, saltwater river at high tide. Sencar is a paradise for sea birds and has large areas of untouched coastal thicket. Samango monkeys made their homes on Sencar, though no one knows quite how they arrived there or how they stay alive in the absence of fresh water. Sencar has only rudimentary beaches.