Rivnens'kiy Nature Reserve is the 2nd largest nature reserve in the Ukraine. It was established by the President of the Ukraine, Leonid Danylovych Kuchma, on April 3, 1999, with an area of 470,468 km2. In accordance with the Resolution of the Cabinet of Ministers of Ukraine on August 14, 2003, the reserve was permanently transferred to a land area of 42,288 km2.