The tripto catalogue lists 103 lakes and reservoirs – from glacial tarns in the Tatras to Masurian lakes and dammed reservoirs in the mountains.
Morskie Oko (1,395 m) is the largest lake in the Polish Tatras, reached by an 8-kilometre trail from Palenica Białczańska. Lake Mamry in Masuria is a complex of six connected lakes covering more than 100 km², with 33 islands and boat trips from Węgorzewo. Lake Solina in the Bieszczady formed behind an 81.8-metre dam, the highest in Poland, with drowned villages on its bottom. Lake Łebsko in Słowiński National Park, separated from the sea by dunes, is the largest coastal lake in Poland. Boats on Lake Czorsztyn sail between the castles of Niedzica and Czorsztyn, and Lake Serwy in the Augustów Forest is up to 42 metres deep, with clear water for kayakers.
Most lakes and reservoirs in the catalogue are in the Silesian region (more than 25, including the Żywiec, Międzybrodzie and Goczałkowice reservoirs), Greater Poland (over a dozen) and Warmia-Masuria, Podlachia and Lesser Poland (a handful each).
In practice: plan anything from two hours to a full day by the water. Access to the shore is usually free; car parks, cruises and equipment hire cost extra. National parks are the exception: Morskie Oko requires a Tatra National Park ticket (11 zł), and Słowiński National Park trails cost 10 zł from May to September. The swimming season runs from late June to August – only swim at designated bathing areas.