Onemana Northern Rocks is a shore-entry snorkeling site located at the northern end of Onemana Beach near Whitianga. The site features a series of rocky inlets and reef structures that provide a local alternative to busier coastal areas. Conditions at this site vary, and snorkelers should be aware of potential surf and rip currents in the area. Water temperatures range from 15C to 22C throughout the year. Due to the nature of the entry and potential water movement, this site is best suited for intermediate snorkelers. Parking and toilet facilities are available near the beach access point.

Spectacle Reef near Whitianga is a diverse site featuring a combination of reef, pinnacle, and wall topography. Divers can explore depths reaching 20 metres, making it suitable for beginners. Access to the site is by boat only, and divers should remain aware of boat traffic in the area. Conditions are generally mild, with water temperatures ranging from 15C to 22C throughout the year. The site offers a varied underwater landscape for those looking to explore the coastal features of the Coromandel region.

The Long Drop is a pinnacle dive located on the seaward side of Okorotere Island near Whitianga. The site features a complex topography of large boulders and steep walls that descend from a shallow depth of 7 metres down to 30 metres. Due to the depth and potential for variable currents, this site is suited for intermediate divers. Access is by boat only. Divers should be aware of hazards including the depth, the risk of nitrogen narcosis, and the presence of strong currents. Water temperatures at this site range from 15C to 21C throughout the year.

South Sunk is a pinnacle and reef site located off Whitianga. The topography features boulders adorned with red, yellow, and grey sponges, jewel anemones, and nudibranchs. Divers can explore depths reaching 30 metres. Conditions are variable, with currents and boat traffic present, making this site suitable for intermediate divers. Access is by boat only. Water temperatures range from 15C to 21C throughout the year. Due to the depth and potential for currents, divers should be prepared for changing conditions during their visit.

Russ' Ravine is a diverse marine site featuring a reef, wall, pinnacle, and cavern system. The topography includes a rock formation that rises to 8 metres at its shallowest point, with the surrounding seabed reaching depths of 28 metres. Divers can explore an excellent swim-through, with ample areas available for those preferring to stay shallower than 18 metres. The site is sheltered from north and west winds, though conditions require intermediate skill due to potential hazards including boat traffic, cold water, and strong currents. Access is by boat only, with an average dive depth of 15 metres.

Shipwreck Bay in Whitianga offers a diverse underwater landscape featuring a bouldery terrain with a rocky bottom. The site topography includes a mix of reef, wall, and cave formations, sloping from a shallow depth of 4 metres down to 18 metres. Accessible only by boat, the site is sheltered from northwest and southwest winds, providing mild currents suitable for divers of all experience levels. The location is also suitable for night diving. Divers should remain aware of boat traffic in the area. Water temperatures range from 15C to 22C throughout the year.

Mahurangi Island, located 100 metres off Hahei Beach near Whitianga, offers a diverse marine environment featuring reefs and kelp forests. The site is suitable for beginners, with depths ranging from 2 to 18 metres and an average depth of 5 metres. Divers and snorkellers can expect mild currents and visibility that varies significantly between 1 and 25 metres. Shore access is available, and the site supports both day and night diving. Facilities at the nearby shore include parking, toilets, showers, changing rooms, a cafe, and a dive shop offering guided tours. Water temperatures fluctuate between 15C and 22C throughout the year.

Okorotere Island, located near Whitianga, offers a marine reserve dive featuring a mix of wall and boulder topography. The site is suitable for beginners, with depths ranging from 7 to 20 metres and an average depth of 15 metres. Divers can explore shallower sections by staying close to the island structure. Access is by boat only, and conditions typically feature mild currents. Divers should remain aware of boat traffic in the area. Water temperatures fluctuate between 15C and 22C throughout the year, depending on the season.