Ruth Island is an artificial island off the south coast of Saint Croix, U.S. Virgin Islands

Saint Croix, U.S. Virgin Islands

Saint Croix is an island in the Caribbean Sea, and a county and constituent district of the United States Virgin Islands , an unincorporated territory of the United States. Formerly the Danish West Indies, they were sold to the United States by Denmark in the Treaty of the Danish West Indies of...

 near Port Alucroix. It was created in the mid 1960s from the dredging of Krauses Lagune and is about 40 acres (0.16 km²).

Because the island is free of small Indian mongooses (Herpestes auropunctatus) biologists introduced the endangered St. Croix Ground Lizard (Ameiva polops) from the Protestant Cay population. Today there are about 30 ground lizards on Ruth Island.