It has been declared a special nature reserve in 2020 in order to preserve the wetlands in the West Morava Valley.

It is located in the Rasina District, spreading on the territory of the town of Kruševac (villages Bela Voda, Globoder and Kukljin) and the municipality of Trstenik (Bresno Polje).

[1] The reserve is located in the central section of the West Morava Valley, situated in the fossil riverbed which in time turned into the wetland.

The wetland is important in preservation of the river's water quality, acting as the West Morava's "kidneys".

[1][2] The Osredak has been described as an excellent indicator of the flora and fauna in this part of Serbia, and an important location for migratory birds.

The Osredak is the most important as the habitat of yellow water-lily with heart-shaped leaves, which itself is protected in Serbia as the natural rarity.

[1] In June 2021, Pošta Srbije, Serbian national postal service, issued commemorative stamps and envelopes with artistic representation of the reserve.