Paradise Island is the only coral island of the Dominican Republic, a perfect circle-round reef in the middle of the ocean with an inner sand-bank. Paradise Island is located on the North Coast of Dominican Republic between El Castillo de Isabela (close to Luperon) and the Haitian border at Manzanillo bay, just off the idyllic fishing village Punta Rusia. In the Atlantic Ocean. Best Snorkeling ever... :)
Aogashima Island, Japan - 青ヶ島 日本 while located in the Philippine Sea, is a volcanic Japanese island. The name Aogashima literally means 'blue island' and is technically part of Tokyo despite being located over 200 miles from central Tokyo.