Melmore Head in Mulroy Bay offers a challenging marine environment defined by dramatic rock walls, underwater gullies, and steep drop-offs. Divers can expect depths ranging from 10 to 30 metres, with an average of 20 metres. The site is subject to strong currents and surge, making it suitable for advanced divers only. Entry is possible via both shore and boat. Visibility typically ranges between 10 and 20 metres. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates common to the region. Facilities at the site include parking, and a typical dive duration is approximately 40 minutes.

Portnablagh in Mulroy Bay offers a shore-entry dive featuring a kelp forest, reef structures, and a cave. Suitable for beginners, the site ranges from 2 to 12 metres in depth with an average of 7 metres. Visibility typically spans 5 to 15 metres. Divers should be aware of mild currents and potential surge or swell near the rocky shoreline. Water temperatures fluctuate between 9 and 15 degrees Celsius, necessitating appropriate thermal protection. Parking is available directly at the site, facilitating easy preparation. Night diving is possible when conditions permit, with typical dive times around 45 minutes.

Marble Hill in Mulroy Bay, Ireland, features a reef environment characterised by rock outcrops at the eastern end of the beach. This site is suitable for beginners, offering a shallow average depth of 3 metres with a range of 1 to 5 metres. Snorkellers can expect mild currents and visibility ranging from 3 to 15 metres. Access is via the shore, with facilities including parking, toilets, and showers available. Water temperatures fluctuate between 9C and 15C throughout the year, necessitating appropriate thermal protection. Hazards at this location include sea urchins and sharp coral. Typical sessions last approximately 45 minutes.

Horn Head in Mulroy Bay offers a diverse underwater landscape featuring reefs, kelp forests, and cave systems. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 15 metres. The site is subject to moderate currents, surge, and surf, requiring boat access and careful planning around slack water. Visibility is highly variable, fluctuating between 5 and 30 metres. Due to water temperatures between 9 and 15 degrees Celsius and potential surge, a drysuit is recommended. Divers should maintain close contact with their guide and carry a surface marker buoy to manage the changing conditions.

Kinnagoe Bay on the Inishowen Peninsula is a shore-access site known for the wreck of the Spanish Armada ship La Trinidad Valencera located offshore. Snorkelers can explore the rocky headlands situated at either end of the beach. Conditions at this site are variable, with moderate currents, surf, and surge present. The water temperature ranges from 9C to 15C throughout the year, requiring appropriate thermal protection. Hazards include cold water, jellyfish, strong currents, surf, and surge. Facilities available at the site include parking, toilets, showers, and equipment rental. This location is suited for intermediate snorkelers.

Magilligan Point is located at the northernmost tip of County Londonderry where Lough Foyle meets the sea. The site features a mix of reef and seagrass habitats. Divers and snorkellers should be aware of moderate currents and surf conditions, which vary throughout the year. Entry is via the shore. Water temperatures range from 9C in the winter months to 15C in late summer. Due to the presence of strong currents and potential entanglement hazards, this site is best suited for intermediate divers. Facilities including parking, toilets, and a cafe are available nearby. Snorkelling is possible, though conditions require careful planning around slack tide.

Stroove Beach on the Inishowen Peninsula offers a rocky headland near the lighthouse, providing an accessible environment for snorkelers. The site features a reef topography with depths ranging from 1 to 5 metres, averaging 3 metres. Snorkelers can explore the kelp forests found along the rocky features. Entry is from the shore, and conditions are generally mild, though the area is subject to surf. Water temperatures fluctuate between 9C and 15C, and the site requires significant thermal protection due to the cold water. Visibility typically ranges from 5 to 15 metres. Facilities at the site include parking, toilets, and showers.