The Keystorm is a wreck located in the St. Lawrence River, resting at depths between 6 and 35 metres. This freshwater site requires boat access and is situated 1609 metres from shore. Divers encounter moderate currents and visibility ranging from 5 to 15 metres. The wreck features an overhead environment, necessitating careful buoyancy control and awareness of entanglement risks. Water temperatures vary significantly, reaching up to 21°C in summer but dropping to near freezing in early spring and late autumn. A drysuit or thick wetsuit is recommended. The site is suitable for intermediate divers, and night diving is permitted for those with appropriate experience and equipment.

The Henry C. Daryaw is a shipwreck lying at depths of 27 to 29 metres off the Brockville Waterfront. This freshwater site requires boat access and is suited for advanced divers with wreck certification. The wreck presents a full overhead environment, necessitating precise buoyancy control and navigation skills. Divers must manage strong currents that can shift direction unexpectedly. Visibility typically ranges from 10 to 30 metres, though conditions vary. Due to the depth and overhead nature of the wreck, carrying a torch and a surface marker buoy is standard practice. Guided tours are available and recommended for those visiting the site for the first time.

Rockport Wall is a freshwater site in the St. Lawrence River featuring a granite wall, drift diving, and wreck exploration. The site offers a wide depth range from 3 to 76 metres, making it suitable for intermediate divers. Shore entry is available near Cornwall's Pub. Conditions vary, with visibility ranging from 5 to 30 metres and moderate currents. The upper shelves between 3 and 6 metres provide rock formations suitable for snorkelling. Divers should be aware of boat traffic, the significant depth, and strong currents. Facilities including parking, a cafe, and a dive shop are located nearby.

Li Ly Parson is a freshwater wreck dive located along the Brockville Waterfront. This drift dive requires boat access due to the strong currents present in the St. Lawrence River. Divers can explore the wreck at depths ranging from 6 to 24 metres, with an average depth of 15 metres. Visibility at the site typically fluctuates between 5 and 15 metres. The river in this area is noted for its lack of a thermocline, with summer water temperatures reaching 20 to 24 degrees Celsius. Given the current and depth, this site is suited for intermediate divers. Divers should remain aware of boat traffic in the vicinity.

Kinghorn is a freshwater wreck dive located 122 metres from shore in the Thousand Islands. The site sits at a uniform depth of 27 metres and is strictly for advanced divers holding deep certification. Access is exclusively by boat charter. Divers must manage strong currents and variable visibility ranging from 5 to 10 metres. Due to the combination of deep water, significant current, and active boat traffic, divers should coordinate descents and ascents closely with their charter crew. Always check current conditions before entry, as they can shift significantly and impact both penetration safety and ascent profiles.

Sparrow Island, located along the Brockville Waterfront, features a shallow bay on its north side characterised by unique rock ledges and aquatic vegetation. This freshwater site is suitable for intermediate divers and snorkellers, with depths ranging from 2 to 14 metres and an average depth of 8 metres. The area experiences strong currents and varying visibility between 5 and 10 metres. Divers and snorkellers should remain aware of boat traffic in the vicinity. The habitat supports a variety of temperate freshwater fish and invertebrates typical of the region. Access to the site is available via both shore and boat entries.

Molly's Gut is a narrow inlet located along the Brockville Waterfront. This site is characterised by calm waters and features a shallow, unidentified shipwreck. The area provides a sheltered environment that differs from the main river channel, making it a suitable location for beginner snorkellers. Access to the water is possible from both the shore and by boat. Due to its protected nature, the site is well-suited for quiet exploration of the underwater topography and the remains of the wreck.

Ivy Lea Campground Beach is a shore-entry dive site located in the Thousand Islands region of the St. Lawrence River. The topography consists of a mix of reef, wall, and artificial reef structures. Divers can explore depths ranging from 1 to 27 metres, with an average depth of 10 metres. Visibility typically fluctuates between 3 and 10 metres. Due to the potential for cold water, strong currents, and entanglement hazards, divers should remain aware of their depth and air consumption. The site features on-site parking and showers, facilitating straightforward kit-up and post-dive procedures. The habitat supports various temperate freshwater fish and invertebrates.