Jezioro Harsz is a freshwater lake in the Masurian Lake District offering shore entries and depths ranging from 20 to 47 metres. The site features submerged structures and a calm environment with no current, though visibility typically fluctuates between 5 and 10 metres. Divers should remain alert for boat traffic when surfacing and exercise caution regarding entanglement risks when navigating structures. Due to consistently cold water, a drysuit or a thick wetsuit with hood and gloves is essential. The habitat supports various temperate freshwater fish and invertebrates typical of the region. While the site is accessible to beginners, deeper sections require advanced experience.

Jezioro Mamry offers a shallow freshwater diving experience focused on submerged archaeological settlement features. The site maintains a consistent depth of 3 metres, making it suitable for beginners and those looking to build confidence in a calm, current-free environment. Visibility is approximately 5 metres, providing sufficient clarity to observe the lakebed structures. Shore entry is straightforward, and the site is well-supported by on-site facilities including parking, toilets, showers, changing rooms, and a rinse station. Dives typically last around 40 minutes, and the convenient infrastructure allows for easy gear management.

Mamry Lake, located in the Masurian Lake District, offers a calm freshwater environment suitable for those building buoyancy skills or undertaking initial open-water experiences. The site features a reef structure that divers can explore. Because visibility is variable, it is recommended to check local conditions before visiting. Divers should use the provided boat access for entry and exit to avoid the shallowest sections of the reef. Due to the presence of rocks on the lake floor, appropriate footwear is advised. As on-site support is not guaranteed, divers should verify available facilities locally prior to arrival.

Upalty is a freshwater dive site located in Mamry Lake, Poland. The site features depths ranging from 20 to 36 metres, requiring careful depth monitoring to mitigate the risk of nitrogen narcosis. Visibility typically fluctuates between 5 and 10 metres. While the site is accessible by boat, entry is also manageable from the shore. Divers can expect to encounter temperate freshwater fish and invertebrates characteristic of the region. Due to the significant depth, beginner divers should plan their profiles carefully and remain within their personal limits. Variable down currents may occur, so maintain awareness throughout the dive.

Mamerki, located in Mamry Lake, features a freshwater wreck and artificial reef structure. The site offers depths ranging from 15 to 40 metres, making shallower sections suitable for beginners, while deeper areas require advanced training. Visibility typically ranges between 5 and 10 metres. Boat access is required to reach the site, and local facilities are available for arranging transport and checking current conditions. Divers can expect to encounter general freshwater habitat life typical of the region. As this is a freshwater lake environment, ensure you are prepared for cold water temperatures, particularly outside of the summer months, and consider using a drysuit.

Arabella is a freshwater wreck site located in Mamry Lake, Poland, resting at depths between 20 and 33 metres. The wreck serves as an artificial reef structure on the lake bed. Visibility at the site fluctuates between 3 and 12 metres, often requiring the use of a torch due to low-light conditions. Entry is via the shore, and the site is suitable for beginners, though the depth requires careful monitoring. Divers should be aware of potential entanglement risks around the wreck structure. On-site facilities include parking, toilets, a cafe, and a dive shop offering guided tours to assist with navigating the wreck layout.

Masurenkanal in Mamry Lake offers a shallow, calm environment suitable for beginners and snorkellers. The site maintains a consistent depth of 5 metres, allowing for straightforward buoyancy management. Divers enter directly from the shore, avoiding the need for boat support. The current is mild, and visibility typically reaches 5 metres. While the site features a structure, divers should remain aware of potential entanglement risks and monitor for nitrogen narcosis or decompression requirements. The habitat supports general freshwater fish and invertebrates typical of the region. Amenities at the site can vary by season, so it is advisable to check for local facility availability before planning a visit.

Jezioro Rydzówka is a freshwater lake located in the Mamry Lake region of Poland. This site features a reef structure and a wreck, providing a varied environment for divers. The lake is generally shallow, making it suitable for beginners working on buoyancy and trim. Shore entry is available, and parking is provided on-site to assist with logistics. Divers should be aware that visibility is variable and moderate currents can occur, requiring careful attention to the shot line during entry and exit. When exploring the wreck structure, maintain caution to avoid entanglement risks. It is recommended to visit on calm, overcast days to minimise surface glare.