Rattray Marsh features a unique natural shale beach and a flat stone lakebed at the edge of a significant wetland. This freshwater site is suitable for intermediate snorkellers, offering depths between 1 and 5 metres with an average of 3 metres. Entry is via the shore. Conditions include mild currents and visibility ranging from 1 to 5 metres, which can be affected by organic matter from the marsh. Water temperatures fluctuate significantly throughout the year, reaching up to 21C in summer, though thermoclines can cause temperatures to drop to 4-7C. Hazards include potential entanglement and low visibility. Species recorded around this area include alewife, white sucker, trout, round goby, common carp, and pike.

Richard's Memorial Park at East Cove offers a freshwater snorkelling experience along the Niagara Peninsula. The site features a rocky headland at the eastern end of the beach, where stone armour and natural lakebed rocks create crevices that attract various fish. Water temperatures fluctuate significantly throughout the year, ranging from 3C in winter to 21C during the summer months. Entry is via the shore, making this a suitable location for beginners. Facilities including parking, toilets, and showers are available on-site. Be aware that conditions can include surf and low visibility. Species recorded around this area include trout, alewife, white sucker, common carp, round goby, sun perch, American crayfish, spotfin shiner, rudd, bluntnose minnow, pike, and small mouth bass.

J.C. Saddington Park offers shore-entry snorkeling along the Niagara Peninsula shoreline. The site is defined by heavy rock rip-rap, where large armor stones create an artificial reef structure. Snorkelers can explore the gaps between these stones, which provide habitat for local fish. Water temperatures in Lake Ontario fluctuate significantly, ranging from 4C in winter to 21C during peak summer months. Due to the cold water and potential for surf, this site is best suited for intermediate snorkelers equipped with appropriate thermal protection. Facilities at the park include parking, toilets, showers, changing rooms, and a rinse station.

Lakefront Promenade Park features a man-made, protected swimming inlet in Mississauga. The site is characterised by a sandy and silty bottom, with rock-lined edges that serve as an artificial reef structure. With depths reaching up to 3 metres, the inlet provides a calm environment suitable for beginners and snorkellers. Water temperatures vary significantly throughout the year, ranging from 4C in winter to 21C during the peak summer months of July and August. The inlet is generally warmer and shallower than the surrounding Lake Ontario. Shore access is available, and the site includes facilities such as parking, toilets, showers, a cafe, and first aid stations. Cold water remains a primary hazard outside of summer.

Gairloch Gardens Shoreline is a freshwater site located on the Niagara Peninsula. Snorkellers access the water via a rocky terrace at the edge of the formal gardens. The entry is considered challenging due to the rock wall, and the site is best suited for intermediate snorkellers. Water temperatures are consistently cold, ranging from 3C in winter to a maximum of 21C during the summer months of July and August. Conditions are variable, with low visibility and cold water presenting the primary hazards. Parking is available for visitors at this quiet location.

Tannery Park is a freshwater dive site located near the mouth of Sixteen Mile Creek in Oakville. This artificial reef features a mix of natural shoreline and man-made structures, offering a transition zone between the creek and the open lake. The site is suitable for intermediate divers, with depths ranging from 1 to 5 metres and an average depth of 3 metres. Divers should expect mild currents and must be prepared for extremely cold water temperatures, which range from 3C to 21C throughout the year. Proper thermal protection is essential to mitigate the high risk of hypothermia. Shore access is available, with facilities including parking, toilets, and showers on-site.

The Jesse Anne is a steel ship wreck located in the Niagara Peninsula, Canada. This site features a flat deck at 18 metres, with the vessel measuring 60 metres in length and 10 metres in width. Divers access the wreck by boat, as it lies approximately 2000 metres from shore. The site is suited for intermediate divers, with depths ranging from 18 to 23 metres. Conditions include mild currents and visibility between 5 and 15 metres. Due to the cold water temperatures, which range from 3 to 15 degrees Celsius, appropriate thermal protection is required. Species recorded around this area include alewife, snails, trout, white sucker, common carp, round goby, and rainbow trout.

The Oakville wreck is a work barge located in the Niagara Peninsula. The vessel rests on a muddy bottom at a depth of 22 metres, with its flat, hard deck situated at 18 metres. This site is suitable for intermediate divers and offers straightforward navigation across the structure. Divers can access the wreck via boat or shore. Conditions include mild currents and visibility ranging from 10 to 20 metres. Water temperatures are consistently cold, typically remaining around 5 degrees Celsius even during summer months. Divers should be prepared for cold water and potential currents. Facilities including air fills, equipment rental, and parking are available nearby.