The beautiful, pristine beaches of Miami attract people from all over the globe, and the aqua-blue clear waters of the Atlantic Ocean open its treasures and wonders to all visitors. Snorkeling is an easy and affordable way to discover the underwater world. If you are a confident swimmer, grab your fins, mask, and enjoy a whole new world. Drift Diving, also called "Valet Diving" is one more activity which is getting extremely popular. Most of Miami's reefs are shallow, about 4.5 – 9 metres deep. This fact makes them perfect for beginners. The plentiful coral and sponges provide great conditions for various types of tropical fish. Larger fish, dolphins, sea turtles, lobsters, and even nurse sharks can be seen here as well. The best sites for snorkelling and diving are Half Moon and Emerald Reef, Rainbow Reef, RJ's Ledge, and Keith’s Canyon. Scuba diving and snorkeling in Pompano Beach offers great reef and wreck dive sites as well. Miami also has a wonderful collection of artificial wrecks and dive sites that usually attract visitors. Check out shallow wrecks like the Belzona and the Belcher Barge, as well as some deeper wrecks like Princess Britney, the Ophelia Brian, and the Tacoma.