Natura 2000 is an ecological network of protected areas in the European Union. The document summarizes three protected areas in the Sajó Valley of Hungary: the Sajó river-bank and meadow, Keleméri stream, and Sajó river. These areas protect endangered species such as the Large Copper butterfly, Corncrake bird, and various fish and mussel species. Local environmental education activities are also mentioned, such as a weekly program for children at a lake.