Iroquois Beach is a freshwater site located on the Niagara Peninsula. The shoreline features rocky entry points that distinguish it from sandy beaches in the area. Snorkellers can access the water directly from the shore, though conditions vary and users should be aware of strong currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. Parking is available for visitors. This site is suitable for beginners, though it is rated 2/5 for snorkelling activity. Due to the nature of the environment, visitors should exercise caution regarding water conditions.

Kiwanis Heydenshore Park offers a shore entry from a pebbly beach, leading to a rocky bottom that functions as both a natural and artificial reef. This site is suitable for beginners, though divers must navigate mild currents and potential hazards including boat traffic, entanglement, and low visibility. Water temperatures fluctuate significantly throughout the year, ranging from 4°C in winter to 21°C in August, presenting a risk of hypothermia. Species recorded around this area include snails, alewife, brown bullhead, round goby, common carp, white sucker, pike, common perch, rainbow trout, and trout. Facilities at the park include parking, toilets, showers, changing rooms, a rinse station, and a cafe.

Lynde Shores Conservation Area offers a shallow freshwater snorkelling experience where Lynde Creek meets Lake Ontario. The site features a reef-like environment with depths ranging from 1 to 5 metres, averaging 3 metres. Entry is via the shore, with the primary area located approximately 10 metres from the shoreline. Conditions are variable, with visibility typically between 2 and 6 metres and mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August. Due to the cold water and low visibility, this site is best suited for beginners who are prepared for freshwater conditions. Typical sessions last around 30 minutes.

Carruthers Marsh is a freshwater site located on the eastern edge of Ajax, where the marsh meets the lake. The underwater terrain consists of a mix of silt and clay, featuring patches of aquatic vegetation. Snorkellers should be aware of the variable conditions, including low visibility, potential surf, and rip currents. Due to the cold water temperatures, which range from 4C to 21C throughout the year, the swimming season is limited to July through September. The site is accessible via a shore entry and is suitable for beginners, though caution regarding entanglement and cold water is advised. Facilities including parking, toilets, and a cafe are available nearby.

Veterans Point at Harwood Avenue South is a freshwater shore dive featuring a man-made breakwater and riprap. The crevices between the large stones function as artificial reefs. Divers can expect depths ranging from 3 to 10 metres, with an average of 6 metres. Conditions include mild currents and visibility between 2 and 8 metres. The site is suitable for beginners, though divers must be prepared for cold water and potential surf. Facilities at the site include parking, toilets, and showers. Species recorded around this area include snail, common carp, alewife, round goby, American crayfish, common perch, rainbow trout, brown bullhead, white sucker, small mouth bass, and pike.

Lakeview Park Beach in the Niagara Peninsula offers a sandy shore entry into Lake Ontario. This site is suitable for beginners, with depths ranging from 1 to 5 metres and an average depth of 3 metres. Snorkellers should be aware of moderate currents, surf, and the potential for low visibility, which typically fluctuates between 2 and 8 metres. Water temperatures vary significantly throughout the year, ranging from 4C to 21C, with comfortable conditions for swimming and snorkelling generally limited to the summer months between July and September. Facilities at the beach include parking, toilets, showers, a rinse station, and first aid services.

Lion's Point on the Niagara Peninsula features a submerged rocky shelf and large boulders along the Ajax waterfront. This structure creates a distinct habitat compared to the surrounding sandy beaches and is accessible via a shore entry. Snorkelers should be aware of variable conditions, including cold water temperatures, thermoclines, and potential hazards such as boat traffic, rip currents, and strong currents. Visibility can be low, and the site is best suited for intermediate-level snorkelers. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August.

Duffins Creek Mouth at Rotary Park in Ajax offers a dynamic freshwater snorkelling environment where the creek meets the lake. This shore entry site is rated for intermediate snorkellers due to the variable conditions found at the confluence. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. The site is best suited for those comfortable with changing currents and lake conditions. As a freshwater location, the topography is defined by the interaction between the creek outflow and the lakebed.