Roś – a lake in the Masurian Lake District in Warmińsko-Mazurskie Voivodeship, southeast of Lake Śniardwy, about 2 km northeast of Pisz. Its shape resembles a separate basin, consisting of three almost parallel channels connected by slight arches. The total length of all the drains is approximately 25 km. It has a relatively well-developed system of river and canal connections with many reservoirs, including the Jeglin Canal across Lake Seksty to Lake Śniardwy.
The northern arm of Lake Roś is very shallow (1 m) and overgrown. There are two bays: Rudzka and Bylicka. Between the middle and northern part of the lake is the Piechowski Peninsula. The second peninsula is Czarny Róg, on which there is a settlement of the same name.
Characteristics of Lake Roś
Rich bottom relief with sandy substrate of variable depth, irregular shape and varied shoreline. There are wet meadows on the shore and forests in the south-eastern and central part. Northern arm of Lake Roś is very shallow and overgrown, with a depth of less than 1 metre.
The outlets of the lake are Wilkus, Święcek, Konopka and the Pisa River.
The southern part of Lake Śniardwy is called Seksty. From it comes the Jeglin Canal, which connects Lake Roś with Lake Seksty. The canal was built between 1845 and 1849.
Water birds nest in the reeds on the shore. More grebes, herons and various species of ducks live here than on busier watercourses. Birds of prey circle high above the surface of the lake.
The name Roś was officially introduced in 1950. Polish name is the equivalent of the German Rosch See. The lake is also called Jezioro Warszawskie or colloquially Warsz (German: Warschau See, literally „Warsaw Lake“).
Water regime
The Wilkus, Święcek, and Konopka rivers flow into the lake. The Pisa River flows out of it.
