Tumbatu Lagoon is a boat dive off Tumbatu Island in Zanzibar with a shallow coral wall, colorful hard coral, and a mix of turtles, rays, moray eels, scorpionfish, lionfish, and other reef life. Access is usually organized from the north coast, and the site suits relaxed reef viewing when current and visibility are steady. It is best treated as a guided boat day rather than a casual shore stop.