Koutsoupia Beach in Kefalonia, Greece, features a rocky seabed and deep green waters suitable for snorkelling. This reef site is best accessed by boat, as the alternative is a three-hour hike. The site is rated 4/5 for snorkelling and is suited for intermediate-level participants. Water temperatures fluctuate throughout the year, ranging from 16C in the winter months to 27C in August. While the site provides a quiet environment away from main tourist hubs, visitors can find a cafe nearby. The habitat supports a variety of Mediterranean reef fish and invertebrates typical of the region.

Agios Thomas in Kefalonia is a reef, cave, and cavern site accessible from the shore. Divers and snorkellers enter via a metal ladder located on a rocky slab, leading directly into a deep, rocky lagoon. The topography is defined by limestone formations, including underwater caves and natural jacuzzis carved into the rock. With depths ranging from 1 to 8 metres and an average of 5 metres, the site is suitable for beginners. Visibility typically spans 15 to 25 metres, and currents are generally mild. Facilities at the site include parking, showers, changing rooms, and a cafe. A typical dive lasts 60 minutes.

Amandakis Beach in Kefalonia is a reef site characterised by a large slanted rock formation that descends into deep water. The underwater topography features natural bridges, ravines, and deep pools. This site is suitable for intermediate divers and offers shore access. Conditions vary, with visibility typically reaching 20 metres or more. Divers should be aware of strong currents and surf, which are common hazards at this location. Facilities available at the site include parking and showers. The area is also highly rated for snorkelling.

Kato Lagadi is a small cove located on Kefalonia, Greece, featuring a diverse topography of reefs, caves, and drop-offs. Divers and snorkellers can explore several small caves and underwater arches. The site is accessed via a shore entry that requires a scramble down a steep rocky path. Depths range from 2 to 25 metres, with an average depth of 8 metres. Conditions are generally suitable for intermediate divers, with mild currents and visibility typically between 10 and 20 metres. Water temperatures fluctuate between 15C and 23C throughout the year. Hazards include the overhead environment within the caves and the presence of sea urchins.

Pessada Beach in Kefalonia consists of two small coves divided by rocky outcrops. The second, more secluded cove features unique rock formations that create shallow, lagoon-like environments suitable for beginners. Snorkellers can observe a variety of marine life, including very common wrasses and rabbitfish. Other species frequently encountered include great barracuda, European parrotfish, Turkish wrasse, striped red mullet, and various bream. Less common sightings include the Mediterranean cardinalfish, painted comber, and the loggerhead sea turtle. Entry is from the shore, where water temperatures range from 16C to 27C. Be cautious of sea urchins when entering the water. Parking and a cafe are located nearby.

Foki Beach is a sheltered, fjord-like bay on Kefalonia, Greece, characterised by olive trees extending to the water's edge. The site features a rocky coastline and a large, swimmable sea cave containing a hidden interior beach. Entry is via the shore, making it accessible for beginners. Conditions are generally mild, though water temperatures vary significantly throughout the year, ranging from 16°C to 27°C. Species recorded around this area include various wrasses, bream, common octopus, and fireworms. Snorkellers should be aware of potential hazards including jellyfish and sea urchins. Parking and a cafe are available at the site.

Kakava Amphorae Yard is an underwater archaeological site located 300 metres off the coast of Kefalonia, Greece. The site features the remains of ancient Roman and Byzantine shipwrecks, with scattered amphorae, metal ship parts, and ancient anchors embedded directly into the reef. Divers and snorkellers can explore these historical remnants at depths ranging from 2 to 8 metres. Access to the site is by boat only. Conditions are generally suitable for intermediate divers, with mild currents and visibility typically between 20 and 25 metres. The water temperature fluctuates throughout the year, ranging from 16C in the cooler months to 26C during the summer.

Emplisi Beach in Kefalonia is a sheltered bay featuring a rocky seabed and limestone formations that serve as natural entry points. The site is suitable for beginners, offering depths ranging from 2 to 15 metres with an average of 8 metres. Divers and snorkellers can expect mild currents and visibility varying between 10 and 40 metres. Shore access is available, and the location includes facilities such as a cafe and toilets. Typical dives last approximately 45 minutes. The site is well-regarded for snorkelling, providing a accessible environment for underwater exploration in the Ionian Islands.