Veliko Blato and Malo Blato are wetlands in the southern part of the Island of Pag. Since marshes are rare on the islands, in 1988 they were placed under protection as ornithological reserves. The area of Veliko Blato is a natural water source that supplies a part of the island of Pag with water, albeit in small quantities. The areas of Veliko and Malo Blato have high biological importance, as they provide a home or temporary refuge to many indigenous species of nesting, migrating and hibernating birds. A total of 168 bird species have been documented at this habitat.

Flocks of black coots (Fulica atra), grebes (Podicipediformes), herons (Ardea), ferruginous ducks (Aythya nyroca), curlews (Numenius), and common spoonbills (Platalea leucorodia) can often be seen. Veliko Blato is an ideal location for bird-lovers and bird-watchers. An observation tower erected at the very edge of the reserve can be used for bird-watching, sight-seeing and photographing the birds and other marsh wildlife.