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 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 Czos is a freshwater lake dive in the Masurian Lake District, offering shore access to depths ranging from 11 to 43 metres. The site features a maximum depth of 43 metres, requiring intermediate skills and careful buoyancy control. Visibility is generally limited to 5 metres. Divers should prepare for cold water temperatures, which fluctuate between 5-8°C in cooler periods and 18-22°C during summer. Due to the depth and cold, a drysuit or thick wetsuit with hood and gloves is recommended. The site offers parking, toilets, and a cafe. Divers can expect to encounter typical temperate freshwater fish and invertebrates common to this habitat.

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.

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.

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.

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.

Leleszki is a freshwater dive site located in the Masurian Lake District of Poland, featuring a wreck and artificial reef structure. The site is suitable for beginners, with depths ranging from 2 to 12 metres and an average depth of 10 metres. Divers can expect mild currents and visibility between 4 and 10 metres. Access is via a shore entry, making it a straightforward location for practice. Water temperatures vary significantly, reaching 18°C to 22°C in summer, while dropping to approximately 7.7°C in April. A wetsuit is recommended for comfort in these conditions. Divers should monitor their depth and remain aware of local current conditions throughout the dive.