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 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 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 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.

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.