Snorkeling in the context of Colorados Archipelago

Icacos Cay (Spanish: Cayo Icacos) is the largest uninhabited cay forming part of a small chain of cays, reefs, and skerries located off the coast of the barrio of Cabezas in the municipality of Fajardo in the northeast of the main island of Puerto Rico. Along with Palominos island, it is part of the La Cordillera Reef Nature Reserve and under the jurisdiction of the Department of Natural Resources and Environment. Icacos is a fifteen-minute water taxi ride from Fajardo. The cay is a popular snorkeling and beach tourism destination.

For some time, there was a limestone quarry on the southern part of the island, with a short railroad system to shuttle limestone from the quarry to the pier.

Eristalis is a large genus of hoverflies, family Syrphidae, in the order Diptera. Several species are known as drone flies (or droneflies) because they bear a resemblance to honeybee drones.

Drone flies and their relatives are fairly common generalist pollinators, the larvae of which are aquatic, and breathe through a long, snorkel-like appendage, hence the common name rat-tailed maggots.

The Belize Barrier Reef is a series of coral reefs straddling the coast of Belize, roughly 300 metres (980 ft) offshore in the north and 40 kilometres (25 mi) in the south within the country limits. The Belize Barrier Reef is a 300-kilometre (190 mi) long section of the 900-kilometre (560 mi) Mesoamerican Barrier Reef System, which is continuous from Cancún on the north-eastern tip of the Yucatán Peninsula through the Riviera Maya and down to Honduras, making it the second largest coral reef system in the world after the Great Barrier Reef in Australia. It is Belize's top tourist destination, popular for scuba diving and snorkeling and attracting almost half of its 260,000 visitors. It is also vital to the country's fishing industry.

Charles Darwin described it as "the most remarkable reef in the West Indies" in 1842.

The Banda Islands (Indonesian: Kepulauan Banda) are a volcanic group of ten small islands in the Banda Sea, about 140 km (87 mi) south of Seram Island and about 2,000 km (1,243 mi) east of Java, and constitute an administrative district (kecamatan) within the Central Maluku Regency in the Indonesian province of Maluku. The islands rise out of 4-to-6-kilometre (2.5 to 3.7 mi) deep ocean and have a total land area of approximately 172 square kilometres (66 sq mi); with associated maritime area this reaches 736.3 square kilometres (284.3 sq mi). They had a population of 18,544 at the 2010 Census and 20,924 at the 2020 Census; the official estimate as of mid-2023 was 21,902. Until the mid-19th century the Banda Islands were the world's only source of the spices nutmeg and mace, produced from the nutmeg tree. The islands are also popular destinations for scuba diving and snorkeling. The main town and administrative centre is Banda Neira, located on the island of the same name.

Freediving, free-diving, free diving, breath-hold diving, or skin diving, is a mode of underwater diving that relies on breath-holding (apnea) until resurfacing rather than the use of breathing apparatus such as scuba gear.Besides the limits of breath-hold, immersion in water and exposure to high ambient pressure also have physiological effects that limit the depths and duration possible in freediving.

Examples of freediving activities are traditional fishing techniques, competitive and non-competitive freediving, competitive and non-competitive spearfishing and freediving photography, synchronised swimming, underwater football, underwater rugby, underwater hockey, underwater target shooting and snorkeling. There are also a range of competitive apnea disciplines; in which competitors attempt to attain great depths, times, or distances on a single breath.

A diving mask (also half mask, free-diving mask, snorkelling mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, underwater hockey players, underwater rugby players, free-divers, and snorkellers to clearly see underwater. Surface supplied divers usually use a full face mask or diving helmet, but in some systems the half mask may be used. When the human eye is in direct contact with water as opposed to air, its normal environment, light entering the eye is refracted by a different angle and the eye is unable to focus the light on the retina. By providing an air space in front of the eyes, the eye is able to focus nearly normally. The shape of the air space in the mask slightly affects the ability to focus. Corrective lenses can be fitted to the inside surface of the viewport or contact lenses may be worn inside the mask to allow normal vision for people with focusing defects.

When the diver descends, the ambient pressure rises, and it becomes necessary to equalise the pressure inside the mask with the external ambient pressure to avoid the barotrauma known as mask squeeze. This is done by allowing sufficient air to flow out through the nose into the mask to relieve the pressure difference, which requires the nose to be included in the airspace of the mask. Equalisation during ascent is automatic as excess air inside the mask easily leaks out past the seal.

Tutuila is the largest and most populous island of American Samoa and is part of the archipelago of the Samoan Islands. It is the third largest island in the Samoan Islands chain of the Central Pacific. It is located roughly 4,000 kilometers (2,500 mi) northeast of Brisbane, Australia and lies over 1,200 kilometers (750 mi) to the northeast of Fiji. It contains a large, natural harbor, Pago Pago Harbor, where Pago Pago, the capital of American Samoa, is situated. Pago Pago International Airport is also located on Tutuila. The island's land expanse is about 68% of the total land area of American Samoa. With 56,000 inhabitants, it is also home to 95% of the population of American Samoa. The island has six terrestrial and three marine ecosystems.

Tutuila has mountainous regions, the highest point of which is 653 meters (2,142 feet). The island is attractive to tourists because of its beaches, coral reefs, and World War II relics, as well as its suitability for sporting activities such as scuba diving, snorkeling, and hiking.

Dry Tortugas National Park is a national park of the United States located about 68 miles (109 km) west of Key West in the Gulf of Mexico, in the United States. The park preserves Fort Jefferson and the several Dry Tortugas islands, the westernmost and most isolated of the Florida Keys. The archipelago's coral reefs are the least disturbed of the Florida Keys reefs.

The park is noted for abundant sea life, tropical bird breeding grounds, colorful coral reefs, and shipwrecks and sunken treasures. The park's centerpiece is Fort Jefferson, a massive but unfinished coastal fortress. Fort Jefferson is the largest brick masonry structure in the Western Hemisphere, composed of more than 16 million bricks. Dry Tortugas is unique in its combination of a largely undisturbed tropical ecosystem with significant historic artifacts. The park is accessible only by seaplane or boat and has averaged about 63,000 visitors annually in the period from 2008 to 2017. Activities include snorkeling, picnicking, birdwatching, camping, scuba diving, saltwater fishing and kayaking. Overnight camping is limited to eight primitive campsites at the Garden Key campground, located just south of Fort Jefferson.

South Padre Island is a resort town in Cameron County, Texas, United States. It is part of the Brownsville-Harlingen metropolitan area. The population was 2,066 at the 2020 census. The town is located on South Padre Island, a barrier island with the Laguna Madre situated to the leeward of the island and the Gulf of Mexico on the windward flank, along the Texas Gulf Coast. South Padre Island is accessible via the Queen Isabella Causeway from the town of Port Isabel. South Padre Island is named after José Nicolás Ballí (Padre Ballí), a Catholic priest and settler.

The island is only accessible via the Queen Isabella Causeway and has become a popular tourist destination for both the spring, summer and for winter Texans. It features many activities such as ecotourism, fishing, snorkeling, kiteboarding, parasailing, surfing and horse back riding. SpaceX Starships are launched from the SpaceX Starbase facility and can be observed across the Brazos Santiago Pass in Boca Chica, Texas.

Kralendijk (Dutch pronunciation: [ˈkraːlə(n)dɛik]) is the capital and main port of the island of Bonaire in the Caribbean Netherlands. The language spoken in the town is Papiamentu, but Dutch and English are widely used. As of 2017, the town had a population of 10,620. In Papiamentu, the town is often called Playa or "beach".

Off the coast of Kralendijk lies the uninhabited island of Klein Bonaire, noted for diving and snorkeling activities. This small island can be reached by water taxi, or, for divers, by practically all of the local dive operators.

Underwater football is a two-team underwater sport that shares common elements with underwater hockey and underwater rugby. As with both of those games, it is played in a swimming pool with snorkeling equipment (mask, snorkel, and fins).

The goal of the game is to manoeuvre (by carrying and passing) a slightly negatively buoyant ball from one side of a pool to the other by players who are completely submerged underwater. Scoring is achieved by placing the ball (under control) in the gutter on the side of the pool. Variations include using a toy rubber torpedo as the ball, and weighing down buckets to rest on the bottom and serve as goals.

Redang Island (Malay: Pulau Redang, Terengganu Malay: Pula Redang) is an island in Kuala Nerus District, Terengganu, Malaysia. It is one of the largest islands off the east coast of Peninsular Malaysia. It is one of nine islands that made up an eponymous marine sanctuary park offering snorkeling and diving opportunities for tourists.

Underwater photography is the practice of capturing images beneath the surface of the water, often done while scuba diving, but can also be done while diving on surface supply, snorkeling, swimming, from a submersible or remotely operated underwater vehicle, or from automated cameras lowered from the surface.

Underwater photography can also be categorized as an art form and a method for recording data. Successful underwater imaging is usually done with specialized equipment and techniques. However, it offers exciting and rare photographic opportunities. Animals such as fish and marine mammals are common subjects, but photographers also pursue shipwrecks, submerged cave systems, underwater "landscapes", invertebrates, seaweeds, geological features, and portraits of fellow divers.

Kealakekua Bay is located on the Kona coast of the island of Hawaiʻi about 12 miles (19 km) south of Kailua-Kona. Settled over a thousand years ago, the surrounding area contains many archeological and historical sites such as religious temples (heiaus) and also includes the spot where the first documented European to reach the Hawaiian islands, Captain James Cook, was killed. It was listed in the National Register of Historic Places listings on the island of Hawaiʻi in 1973 as the Kealakekua Bay Historical District. The bay is a marine life conservation district, a popular destination for kayaking, scuba diving, and snorkeling.