Maria's Heart is a reef site in the Thousand Islands, Indonesia, characterised by its hard coral formations and distinctive heart-shaped sponges. The topography includes areas of silt on the reef structure. This site requires boat access and is suited for intermediate divers due to the presence of strong currents. Divers should be aware of variable conditions, including potential low visibility and boat traffic in the area. Water temperatures remain consistent throughout the year, typically ranging between 29C and 30C.

Jevry's Drop in the Thousand Islands is a multi-faceted dive site featuring a reef, drop-off, and canyon, with artificial reef structures present. The site is accessed by boat and is suitable for intermediate divers. Divers can explore depths reaching 30 metres during a typical 50-minute dive. Conditions include moderate currents and visibility ranging from 15 to 30 metres. Water temperatures remain consistent between 29C and 30C throughout the year. Hazards at this location include boat traffic, potential entanglement, surge, and sharp coral. Divers should exercise caution regarding visibility fluctuations.

Semak Daun is a shallow reef site located in the Thousand Islands, Indonesia. The site is characterised by a consistent depth of 4 metres, making it a suitable location for beginner divers. Access to the reef is by boat, and underwater conditions typically feature mild currents. Water temperatures remain stable throughout the year, ranging between 29C and 30C. As a shallow reef environment, it offers a straightforward diving experience for those looking to explore the local marine topography.

Pulau Semak Daun is an uninhabited island in the Thousand Islands, Indonesia, featuring a reef environment suitable for snorkelers. The site offers a very shallow, sandy entry, allowing beginners to practice in waist-deep water before exploring the reef edge. Depths at this location range from 1 to 15 metres, with an average depth of 8 metres. Conditions are generally mild, with visibility typically ranging between 10 and 25 metres. Water temperatures remain consistent throughout the year, fluctuating between 29 and 30 degrees Celsius. This site is accessible directly from the shore and is well-suited for those new to snorkelling.

Kayu Angin Genteng is an uninhabited island in the Thousand Islands, Indonesia, featuring a reef environment suitable for snorkelling. Access to this site requires a boat. The water temperature remains consistent throughout the year, ranging between 29C and 30C. Species recorded around this area include wrasses, butterflyfish, anemonefish, and various invertebrates such as nudibranchs and clams. As an intermediate-level site, it offers a quiet experience away from populated areas. Snorkellers should be prepared for boat-based entry and exit procedures while exploring the reef topography.

Pulau Gosong Perak is a submerged sandbar in the Thousand Islands that emerges only at low tide. The site features a reef slope with a drop-off, reaching depths between 1 and 15 metres with an average of 5 metres. Access is by boat only, and the site is suited for intermediate snorkelers due to the depth and potential for sharp coral. Visibility typically ranges from 5 to 15 metres with mild currents. Species recorded around this area include wrasses, anemonefish, butterflyfish, and various invertebrates such as nudibranchs and clams. Water temperatures remain consistent throughout the year, ranging between 29 and 30 degrees Celsius.

Genteng Kecil is a reef site in the Thousand Islands, Indonesia, offering depths between 5m and 25m with an average of 12m. The site is suitable for beginner divers and features a dedicated platform at 6m for skill practice. Access is by boat only. Divers may encounter moderate currents, and visibility ranges from 8m to 30m. Hazards include boat traffic, current, and low visibility. Night diving is available at this location. Species recorded around this area include wrasses, anemonefish, butterflyfish, groupers, and various invertebrates such as sea stars and slugs.

Jetski Lagoon is a marine dive site located within the Thousand Islands, Indonesia. Water temperatures at this location are relatively stable, ranging between 29C and 30C throughout the year. While specific observations at this exact site are limited, species recorded around this area include various wrasses. Divers should be aware that conditions at this site can vary. Access to the lagoon is typically via boat from the surrounding islands. The site is suitable for those looking to explore the marine environment of the Thousand Islands, though visitors should note that the area is generally considered to have limited appeal for diving.