St. Vincent and the Grenadines, in the southern Eastern Caribbean, has 32 islands. St. Vincent, the mainland, is the largest island with a steep mountainous landscape. Other inhabited islands include Young Island, Bequia, Mustique, Canouan, Mayreau, Union Island, Palm Island and Petit St. Vincent. St. Vincent and the Grenadines has a large extent of coral reefs with 168 km² of reef area. Tobago Cays Marine Park, one of the longest established marine managed areas in the Caribbean, is an important nursery area for juvenile green turtles, conch, lobster, and fish.