Redykajny Lake is the most northerly reservoir of Olsztyn, located on the border of the Gutkowo and Redykajny districts. Its area is almost 30ha and its maximum depth reaches 20m.
The edges of the lake are quite steep, but the descent to the water table slopes gently, especially in the case of a dozen or so wild, unguarded beaches, which you can reach by the forest paths leading among the pine trees. These grass-sand beaches in the warmer months are the perfect place for a peaceful rest in the bosom of nature. The water in the lake is clean, which favours swimming. The most popular beach is located on the south-western shore of the lake, but due to the proximity of larger reservoirs, it is not heavily besieged.
In the lake there are many species of fish. Often, perch and pike fall prey to the anglers. Most of them fish from the shore, some use boats selecting to catch in deeper waters. The Redykajny nature reserve was created in the area in order to protect its peat bogs and the surrounding vegetation.