Northeast of Dar es Salaam and Zanzibar, the snorkeling at Mnemba Island is known for the vast fringing reef encircling the island. Many people incorrectly refer to this island as Mnemba Atoll. Misali Island lies within the Pemba Channel Conservation Area. The pristine reef in this marine conservation area is habitat to over 430 species of fish. The water depth ranges from 5 to 15 feet deep over the reef. During Mnemba Island snorkeling, you may encounter moorish idols, blue tangs, clownfish, snapper, starfish, stingrays, green sea turtles and moray eels. If you snorkel further off-shore, you may be swimming with bottlenose dolphins.
Mnemba Island is located 2 miles to the northeast of the coast of Zanzibar. There are regular snorkel boat tours from the village of Nungwi on Zanzibar (20 minute boat ride). Keep in mind that the island is private and only accessible to hotel guests. Since the resort enforces its private island out to 600 feet offshore, the snorkel boat tours just visit the offshore reef. The best snorkeling is on the northwest side of the island.
Overall, Mnemba Island is the 2nd most popular snorkel dive spot of all 2 snorkeling dives in Tanzania.