Cobourg East Pier (Beach Side) is a freshwater snorkel site located in Cobourg, Canada. The site features artificial reef structures composed of concrete and rock, which attract various fish species. Snorkelling occurs along the eastern side of the pier, where visibility typically ranges from 5 to 15 metres. Depths are shallow, averaging 3 metres with a maximum of 6 metres. This site is suitable for advanced snorkelers due to potential boat traffic and cold water conditions. Water temperatures fluctuate significantly throughout the year, peaking between July and September. Entry is via the shore, and users should remain clear of the harbour entrance at all times.

Monk's Cove Park in Kingston offers a freshwater snorkeling experience featuring a rocky shoreline and artificial reef structures. The site is suited for intermediate snorkelers who can manage shore entries and variable conditions, including potential surf. Water temperatures fluctuate significantly throughout the year, ranging from 3°C in winter to 22°C in August. Facilities at the park include parking, toilets, and showers. While specific observations at this exact location are not confirmed, species recorded around this area include trout, common carp, longnose gar, white sucker, brown trout, creek chub, small mouth bass, round goby, pike, alewife, and lake trout.

Lucas Point Park in Kingston offers a unique freshwater snorkelling experience over flat, pitted limestone rock formations. These shelf-like structures, which resemble the topography found in Tobermory, contain visible fossils within the rock. The site is accessed via the shore and is best suited for intermediate snorkellers due to the mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 3C in the winter months to 22C in August. Facilities at the park include parking and toilets for visitor convenience. The site is rated 4/5 for snorkelling, providing an interesting underwater landscape to explore.

The Ganaraska River Mouth at the outer pier offers a freshwater snorkelling experience where the river meets Lake Ontario. This site features an artificial reef structure along the western pier. Snorkellers should be prepared for moderate currents and variable visibility, with water temperatures ranging from 3C to 22C throughout the year. The site is best suited for intermediate snorkellers due to potential hazards including boat traffic, cold water, and strong currents. Species recorded around this area include trout, common carp, round goby, white sucker, small mouth bass, and alewife. Access is via the shore, with parking and toilets available nearby.

The P.B. Locke is a 136-foot schooner built in 1873 that later served as a stone-hauling barge before sinking in a storm in 1912. Located 3000 metres from shore in Lake Ontario, this wreck site is accessible only by boat. The structure is significantly broken up, yet divers can observe the anchor, the ship's bell, a stove, and various tools and dishes. Depths range from 5 to 24 metres, with visibility between 3 and 15 metres. Conditions include mild currents and a thermocline. Due to the depth, cold water, and entanglement hazards, this site is suitable for advanced divers. Night diving is permitted.

The P.B. Locke is a shipwreck site located 3000 metres offshore in Lake Ontario. Divers can explore the wreck at depths ranging from 18 to 24 metres, with an average depth of 21 metres. Access to the site requires a boat. Visibility at the site varies significantly, ranging from 3 to 15 metres, and currents are generally mild. The site is suitable for intermediate divers. Due to the nature of the wreck, entanglement is a potential hazard. Water temperatures are cold, fluctuating between 2 and 14 degrees Celsius throughout the year. Night diving is permitted at this location.

The Juno is a shallow freshwater shipwreck located 200 metres from shore in Kingston, Canada. Resting at an average depth of 5 metres, this site is suitable for beginners and accessible by both boat and shore entry. Divers and snorkellers experience mild currents and visibility ranging from 5 to 10 metres. Water temperatures fluctuate significantly throughout the year, ranging from 3 to 22 degrees Celsius, requiring appropriate thermal protection. The site features the remains of the wreck structure, which provides a habitat for various temperate freshwater fish and invertebrates. Due to the location, visitors should remain aware of boat traffic and potential entanglement hazards.

Bond Head Park, located east of Bowmanville, offers shore access for snorkelling via a small beach area and boat launch. The site is characterised by artificial armour stone structures installed for shoreline protection. These rocky features provide habitat for small fish and crustaceans. Water temperatures at this location vary significantly throughout the year, ranging from 3C in February to 21C in August. Due to the nature of the environment and entry, this site is best suited for intermediate snorkellers. Conditions can be variable, and visitors should exercise caution when navigating the rocky shoreline and boat launch areas.