Dias is a large reef site located 2000 metres off the coast of Halkidiki, Greece. The topography features impressive rock formations, large walls, and caves, offering a varied seascape for intermediate divers. The site supports multilevel dives ranging from 5 metres to 40 metres, with an average depth of 25 metres. Access is by boat only. Visibility typically ranges between 10 and 30 metres, with mild currents present. Water temperatures fluctuate between 13C and 20C throughout the year. The site is suitable for night diving, with typical dive durations around 50 minutes. Divers should be aware of sea urchins and sharp coral in the area.

The Drenia Islands are a cluster of six small islets located 3000 metres off the coast of Ouranoupoli in Halkidiki. The site features a protected, shallow lagoon formed between the islands, which is ideal for exploring rocky reefs. Depths range from 2 to 45 metres, with an average depth of 4 metres, making it suitable for beginners. Conditions vary, with visibility typically between 10 and 25 metres and mild currents. Access is available by both shore and boat. Facilities on-site include changing rooms, showers, toilets, and a cafe. Divers and snorkellers should remain aware of boat traffic in the area.

Agios Nikolaos near Ormos Panagias features shallow rock formations and sandy-bottomed waters, making it suitable for beginner snorkellers. The site is notable for an ancient Greek column submerged at a depth of 4 to 5 metres. Shore access is available, and the area offers visibility ranging from 10 to 30 metres with mild currents. Facilities at the site include parking, toilets, showers, and a dive shop. Water temperatures fluctuate throughout the year, ranging from 15C in the winter months to 27C during the peak of summer.

Stratoni Seahorse Colony in Halkidiki is a unique marine site featuring artificial structures known as seahorse hotels designed to support the local population. The site consists of both natural reef and artificial reef elements, with depths ranging from 7 to 17 metres and an average depth of 10 metres. Divers access the site from the shore, where they may encounter mild currents and visibility reaching up to 30 metres. The area is marked by yellow buoys to protect the habitat. Guided tours are available, and the site is suitable for night diving. Due to boat traffic in the area, divers should remain vigilant and be aware of potential entanglement hazards.

Armenistis Bay offers a varied shore dive featuring a reef that descends from 5 metres to 42 metres, with an average depth of 25 metres. The site includes a cave, providing additional topography to explore. Visibility typically ranges between 15 and 20 metres, with moderate currents present. Entry is via the shore, where divers should navigate the surf and shore break with care. The site is suitable for beginners and supports night diving. Species recorded around this area include wrasses, white seabream, bream, fried egg jellyfish, mauve stinger, sea stars, crabs, and snails. A cafe is available on-site for post-dive refreshments.

Kavourotripes, also known as Orange Beach, features a series of small rocky coves defined by dramatic rock formations and white sand. This site is suitable for beginners, offering a shallow reef environment with depths ranging from 1 to 10 metres, averaging 5 metres. Snorkellers can explore the intricate coastline and its various nooks and crannies. Access is via the shore, and conditions generally include mild currents and visibility between 5 and 25 metres. Facilities available at the site include parking, toilets, and a cafe. Be aware of potential hazards including sharp rock formations and surf conditions.

Sithonia in Halkidiki offers a diverse underwater landscape featuring a combination of reef, wall, cave, and artificial reef structures. Suitable for intermediate divers, the site ranges in depth from 3 to 45 metres with an average of 20 metres. Divers experience mild currents and visibility between 10 and 30 metres. Access is via a shore entry, though divers must navigate a surf break at the shoreline. The site is well-equipped with facilities including parking, showers, changing rooms, and a rinse station. Night diving is permitted, and the site is accessible for full-day trips with on-site air fills and equipment rental available.

Akti Kalogrias in Halkidiki offers a versatile reef environment suitable for all skill levels, including beginners. Divers can explore depths ranging from 3 to 40 metres, with an average depth of 3 metres. Access is via a shore entry, with the reef located approximately 200 metres from the beach. Conditions are generally mild, with visibility ranging between 10 and 30 metres. The site is well-supported by local facilities, including parking, toilets, showers, changing rooms, a cafe, and a dive shop. Night diving is also available at this location. Divers should remain aware of boat traffic and the presence of sea urchins in the area.