The sister islands of Tahaa and Raiatea lie in a lagoon that delights visitors with its colours of saphire and emerald. They are surrounded by a reef. Although Raiatea is also relatively untouched, Tahaa has an even more primordial charm. The island, with its gentle slopes and craggy coastline is also called "Vanilla Island". A visit to a vanilla farm is highly recommended. A unique feature on Tahaa is the turtle reserve, which is working to conserve stocks of sea turtles. The island also has numerous white sandy beaches while the lagoon is a true paradise for divers and windsurfers .