Jezioro Juno is a freshwater lake dive site in Poland featuring an artificial reef structure. The site offers depths ranging from 11 to 33 metres, allowing for both shallow skills practice and deeper exploration. Divers enter directly from the shore, where parking is available. Conditions include a mild current and a consistent visibility of 5 metres. Given the nature of the artificial reef, divers should be mindful of potential entanglement hazards regarding hoses and gauges. Due to the limited visibility, a torch is recommended for daytime dives, and a surface marker buoy is advised for those exploring the deeper sections of the site.

Jez Glebokie is a freshwater lake in the Masurian Lake District, offering shore-accessible diving with depths ranging from 5 to 36 metres. The site features a unique microclimate, with cooler and more humid conditions often present in the morning. Divers should expect visibility around 5 metres, requiring effective torch technique and close buddy contact. As the site reaches depths of 36 metres, it is classified as intermediate territory suitable for decompression diving. Proper thermal protection is necessary to manage cold water temperatures. With no current, the dive focuses on buoyancy control and careful gas planning for a conservative ascent.

Jezioro Lampackie is a calm freshwater lake located in the Masurian Lake District of Poland. The site offers a shallow environment with a maximum depth of 11 metres, and the primary diving zone is situated between 5 and 11 metres. Visibility is typically around 5 metres. The site is suitable for beginners and can be accessed via shore or boat. Divers should maintain strict buoyancy control to avoid contact with the lake bed. As this is a freshwater environment, expect a typical inland ecosystem. Sturdy water shoes are recommended for shore entries to navigate the terrain comfortably.

Jezioro Pilakno is a freshwater site in the Masurian Lake District offering both shore and boat access. The topography features a sharp drop-off, with depths ranging from 9 metres down to 56 metres and an average depth of 13 metres. Visibility typically spans 5 to 10 metres. Due to a thermocline, water temperatures drop significantly below 5 to 6 metres, reaching 3°C to 4°C, while surface temperatures in summer hover between 18°C and 20°C. Divers should be prepared for cold water conditions year-round, making drysuits or thick wetsuits advisable. The site supports night diving and provides on-site facilities including air fills, a dive shop, gear storage, a café, showers, and toilets.

Jez Majcz Wielki is a freshwater lake site located in the Masurian Lake District, offering shore access for divers. The site features depths ranging from 6 to 17 metres, with an average depth of 6 metres, providing a suitable environment for beginners to practice buoyancy and technique. Visibility at the site is variable, typically ranging between 10 and 30 metres. Parking is available at the water's edge, allowing for convenient gear preparation. While the site is accessible year-round, summer months provide the warmest surface temperatures and extended daylight hours for improved natural light during dives.

Jezioro Widrynskie is a freshwater lake dive located in the Masurian Lake District. Divers can access the site directly from the shore. The lake features depths ranging from 15 to 26 metres, providing a suitable environment for beginner divers to practise buoyancy. Visibility typically ranges between 5 and 10 metres, requiring careful navigation. Divers should be prepared for cold water temperatures and the presence of thermoclines during descent. Submerged features may have sharp edges, so maintain awareness of your surroundings. Facilities at the site include parking and toilets, making it a convenient location for a 40-minute dive.

Leleskie Lake in the Masurian Lake District is a purpose-built dive site featuring an artificial reef and a submerged wreck. The site offers shore entry and depths ranging from 8 to 49 metres, with an average depth of 12 metres. Divers encounter mild currents and visibility between 2 and 8 metres. Significant temperature variations occur at depth, making full exposure protection advisable year-round. The site is suitable for intermediate divers, and night diving is permitted. On-site facilities include air fills, equipment rental, and guided tours, which are recommended for locating the underwater structures due to variable visibility.

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.