Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from 25 to 35 meters (80 to 120 feet). After descending 20 meters (60 feet), the hole widens considerably into a cavern with a diameter of 100 meters (330 feet).
Great Blue Hole, Underwater Sink hole: Belize
This place is the perfect place for scuba divers. As you can see on the photo above, this site is truly a wonderful place to enjoy. The Great Blue Hole is a large underwater sinkhole off of the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 45 miles from the mainland and Belize City. The hole is circular in shape, over 1,000 feet across and 400 feet deep. It was formed as a limestone cave system during the last ice age when sea levels were much lower. On-shore caves of similar formation, as large collapsed sinkholes, are well known in Belize. This site was declared as one of the top ten scuba diving sites in the world.
Ria de Aveiro Lagoon: Portugal
One of the best places to spend your summer vacation is on the blue waters of the Ria de Aveiro. It is the most extensive shallow coastal lagoon in Portugal. It is located on the Western Atlantic coast of Portugal, between Espinho and Cabo Mondego, The area covered by the lagoon corresponds approximately to a minimum of 66 square km, at low spring tides, and a maximum of 83 square km, at high spring tides. An extensive sand barrier exists along the coast, protecting and separating the enclosed lagoon from the Atlantic Ocean.
Feast your eyes by watching lovely birds feed on the shallow waters of Laguna Colorada. Laguna Colorado is a shallow salt lake in the southwest of the altiplano of Bolivia and close to the border with Chile. The lake contains borax islands, whose white color contrasts nicely with the reddish color of its waters, which is caused by red sediments and pigmentation of some algae.
Marovo Lagoon: Solomon Islands
Have fun and enjoy the waters of the world's largest saltwater lagoon in the world - Marovo Lagoon. You can swim, snorkel, and scuba dive on this lagoon - paradise. It is located in the New Georgia north of Vanguru Island. There are many islands in the lagoon, some of which are inhabited. The people live mainly by subsistence agriculture and fishing and speak the Marovo language. The lagoon is a popular destination for diving.
credited to scienceray.com
yeah....eye catching,so captivating Lagoons. It can be a great place for relaxation