Melvin Bay is a deep-water site located near Rankin Inlet, Canada. The topography is defined by steep drop-offs that descend into the cold waters of the inlet. Water temperatures fluctuate significantly throughout the year, ranging from -2C in the winter months to a maximum of 6C during August and September. Due to the challenging environmental conditions and cold water, this site is suited for advanced snorkellers. Access to the water is possible via both shore and boat entries. As a high-latitude marine environment, the site is subject to variable conditions and requires appropriate thermal protection for all in-water activities.

Located within Iqalugaarjuup Nunanga Territorial Park, the Meliadine River Mouth is where the river meets the sea. This site features shallow water and stone weirs used by migrating fish. Access is via the shore. The environment is extremely cold year-round, with water temperatures typically ranging from -2C to 6C. Due to the high risk of hypothermia, swimming is not recommended without specialized cold-water gear. The site is rated 3/5 for snorkelling and is suitable for beginners who are properly equipped for Arctic conditions.

Thomson Island South Shore offers a rugged underwater environment defined by dramatic rock formations and dense kelp forests. Located in Canada near Rankin Inlet, this site is accessible only by boat. Divers should be prepared for extremely cold water temperatures ranging from -2C to 6C, which require specialized cold-water gear. Visibility at the site varies up to 15 metres, and currents are generally moderate. The site is suited for intermediate divers due to the challenging thermal conditions. While the topography provides a complex habitat, divers should remain aware of the significant cold-water hazards present throughout the year.

The Barrier Islands (East Chain) near Rankin Inlet consist of a long chain of islands acting as a natural breakwater. This topography creates calm pockets of water suitable for snorkeling. The site features rocky crevices and depths ranging from 5 to 15 metres, with an average of 10 metres. Access is by boat only, and the site is suited for intermediate snorkelers. Visibility typically ranges between 5 and 15 metres. Due to the Arctic location, water temperatures are extremely cold, ranging from -2C to 6C, necessitating the use of dry suits. Hazards include boat traffic and the extreme cold.

Marble Island is an Arctic site defined by white quartzite rock formations and a sheltered harbour. The site features both natural reef and artificial reef structures. Due to the extreme environment, water temperatures remain consistently cold, ranging from -2C to 7C throughout the year. Snorkelling here is rated as advanced due to the challenging conditions and the requirement for appropriate thermal protection. Access to the water is possible via both shore and boat entries. Divers and snorkellers should be aware of potential hazards including cold water, strong currents, and boat traffic in the area.