Lega river - Also known as Jegrznia. This is the main river of Olecko county with a length of 110.6 km (including about 88 km within Warmia and Mazury). It has its source in the hills of Szalejki village at an altitude of about 225 meters above sea level. It flows through the following lakes: Czarne, Olecko Wielkie, Olecko Małe, Selment Wielki, Stackie i Dręstwo.
Dobskie lake - It lies at a distance of 5 km from Olecko and has an area of 162 ha. The maximum depth reaches 43.3 m. The villages around are Dobki, Gordejki, Duły and Jaśki. Here you can catch roach, whitefish, bream, whitefish, eel, pike, tench, perch.