Penangkaran Hiu in Karimunjawa is a marine site featuring both reef and artificial reef structures. It is primarily known for its shark conservation pens. The site is suitable for beginners and offers a snorkel rating of 3 out of 5. Water temperatures remain consistent throughout the year, ranging between 29C and 30C. Divers and snorkellers can access the site via both shore and boat entries. Conditions are generally manageable with mild currents. As this is a shark conservation area, visitors should be aware of the presence of sharks in the water.

Spot Maer is a reef site located in Karimunjawa, Indonesia, within the Karimunjawa National Park. Known as a coral garden, the site features a vast sloping reef with high coral density. It is a dedicated snorkel location suitable for beginners, with depths ranging from 3 to 9 metres and an average depth of 6 metres. Access to the site is by boat only. Conditions are generally mild with currents described as mild and visibility typically ranging between 10 and 20 metres. Water temperatures remain consistent throughout the year, fluctuating between 29 and 30 degrees Celsius.

Tanjung Gelam, also known as Ujung Gelam, is a reef site in Karimunjawa, Indonesia, offering a rare shore entry point on the main island. The reef begins just metres from the beach, making it suitable for both diving and snorkelling. Divers and snorkellers can explore depths ranging from 1 to 25 metres, with an average depth of 12 metres. Conditions are generally mild with visibility between 5 and 15 metres. The site is well-suited for beginners, though caution is advised regarding sharp coral. Facilities including toilets and equipment rental are available on-site. The habitat supports a variety of reef fish and invertebrates typical of the region.

Taman Karang in Karimunjawa, Indonesia, features a combination of reef and wreck topography suitable for beginner divers. Located 5000 metres from shore, the site requires boat access and offers depths ranging from 5 to 25 metres, with an average of 12 metres. Conditions include mild currents and water temperatures between 29 and 30C. Visibility is variable, typically between 5 and 10 metres. Divers should be aware of potential jellyfish and boat traffic on the surface. Wearing a full wetsuit or skin suit is recommended for protection. Night diving is available at this location, with typical dive times around 50 minutes.

Pulau Tengah in Karimunjawa, Indonesia, features a distinct reef system characterised by walls and drop-offs. The site reaches depths between 8 and 30 metres, making it suitable for intermediate divers. Access is exclusively by boat, as the site is located 5000 metres from the shore. Divers and snorkellers can expect moderate currents and visibility ranging from 5 to 12 metres. Water temperatures remain consistent throughout the year, typically between 29 and 30 degrees Celsius. Hazards at this location include boat traffic, sharp coral, and the presence of sharks. On-site facilities include toilets, a cafe, and guided tours.

Karang Torpedo is a historical site located in Karimunjawa, Indonesia, featuring a collection of WWII-era torpedoes resting on the seabed. These historical remnants are now encrusted in coral, creating a unique artificial reef structure that blends history with the surrounding marine environment. The site is accessible only by boat and is suitable for intermediate divers. With a snorkel rating of 4 out of 5, it also provides an accessible experience for those surface swimming. Water temperatures remain consistent throughout the year, typically ranging between 29C and 30C. Divers and snorkellers should be prepared for boat-based entry and exit procedures.

Cemara Besar is a shallow reef located in Karimunjawa, Indonesia, featuring a mix of massive and branching coral formations. The site is suitable for beginners, with depths ranging from 5 to 20 metres and an average depth of 12 metres. Divers and snorkellers can expect mild currents and visibility between 5 and 30 metres. Access to the site requires a boat. The reef supports a variety of reef fish and invertebrates typical of the region. Divers should be aware of potential hazards, including sharp coral and lionfish. Night diving is permitted at this location, with typical dive times lasting approximately 45 minutes.

Pulau Cilik is a reef site located on the eastern side of the Karimunjawa archipelago. The site features hard coral formations situated close to the surface, making it well-suited for snorkelling. Depths typically range from 2 to 5 metres, with an average of 3 metres. Visibility reaches up to 15 metres, and water temperatures remain consistent between 29C and 30C throughout the year. The site experiences mild currents and is accessible by both shore and boat. Facilities at the location include a cafe. Visitors should be aware of hazards including sharp coral and surf.