Silfra is a unique freshwater fissure located in Thingvellir National Park, Iceland, formed by the tectonic plates of North America and Eurasia drifting apart. This site features a rugged underwater landscape of rock walls and caves. Divers and snorkellers experience exceptional visibility reaching 100 metres in the glacial water. The site is accessed via a shore entry and involves a mild current. With an average depth of 10 metres and a maximum of 18 metres, the environment is suitable for intermediate divers. Water temperatures remain a constant 2 to 4 degrees Celsius year-round. Hazards include the cold water, overhead environments, and the presence of current.

Davidsgja is a freshwater dive site in Thingvellir National Park, Iceland, characterised by its underwater topography and overhead environment. Divers can reach depths between 15 and 21 metres, with visibility typically extending to 30 metres. The site features a mild current and requires a shore entry. Due to the cold water temperatures of 2 to 4 degrees Celsius and the overhead nature of the site, it is suited for intermediate divers with drysuit experience and overhead awareness. Guided tours are available for those visiting the site. The primary experience focuses on the geological structure of the fissure rather than marine life.

Kerid is a freshwater dive site located within a volcanic crater in southwest Iceland. Divers experience a geological environment inside a flooded caldera with depths ranging from 7 to 15 metres. Visibility typically reaches up to 15 metres. The site offers a calm environment suitable for beginners to practice buoyancy and trim. Shore entry is straightforward, with parking and toilets available on site. Due to water temperatures ranging between 6 and 12 degrees Celsius, a drysuit with thermal undergarments is essential for all divers. The site is accessible year-round, though divers should check for local access restrictions near the crater rim before planning a dive.

Vidhey is a marine dive site located off the coast of Southwest Iceland, featuring a mix of reef and kelp forest topography. Divers can explore depths ranging from 10 to 30 metres, with the shallower sections dominated by kelp that transitions into open reef as depth increases. Visibility typically ranges between 5 and 15 metres. Given the water temperatures of 4 to 11 degrees Celsius, drysuit experience and cold-water familiarity are essential. While currents are generally mild, divers must remain vigilant regarding surge and swell, which can develop rapidly. Due to dangerous surf and shore break conditions, boat entry is recommended over shore entry for this site.

Gullkistuvik is a reef site located off the coast of Southwest Iceland. The topography features a reef that descends to depths of 25 metres, with most activity occurring in the shallower sections between 15 and 25 metres. Divers can access the site via shore or boat. Conditions are generally calm with no significant current and visibility ranging from 5 to 10 metres. Due to water temperatures fluctuating between 4 and 11 degrees Celsius throughout the year, a drysuit with appropriate undergarments is essential for all divers. This site is suitable for beginners, though local facilities are limited.