Twin Islands Rock Piles in Summersville Lake features submerged granite formations situated between two islands. This site offers depths ranging from 8 to 46 metres, with an average depth of 24 metres. Access is by boat only, as the site is located 1000 metres from the shore. Divers and snorkellers should be prepared for mild currents and variable visibility between 5 and 15 metres. The lake stratifies during summer months, with a thermocline typically occurring between 4.5 and 9 metres. Water temperatures fluctuate significantly, ranging from 42°F in winter to 78°F in summer. Due to the depth and potential for cold water, this site is suited for intermediate skill levels.

Bolar Mountain Beach is a freshwater site located at the north end of Summersville Lake. This beginner-friendly location features a sandy shore entry leading into shallow water, with depths typically ranging from 1 to 2 metres and an average depth of 1 metre. The site is suitable for snorkelers looking for a relaxed environment. Visitors should remain aware of boat traffic in the area. On-site facilities include parking, toilets, and showers to support visitors. As a freshwater environment, the site offers a straightforward experience for those new to snorkelling.

Greenwood Point Cove in Summersville Lake offers a freshwater environment featuring both reef and artificial reef structures. The site reaches depths between 2 and 30 metres, with an average depth of 12 metres. Divers and snorkellers encounter visibility ranging from 9 to 18 metres. The area is subject to thermal stratification, with a thermocline typically occurring between 4.5 and 9 metres deep. Below this layer, the water remains cold. Access is available via boat or shore, though the site is located 4828 metres from the shore. Hazards include boat traffic, cold water, deep sections, entanglement risks, and overhead environments. Facilities at the location include parking, toilets, showers, and boat charter services.