Nagy-Sárrét only preserved the grand marshlands in its name. The land was full of marshes even in the past century. Due to water regulation at the beginning of the 19th century, the land turned into a lick bleak.

The bustards of the region protected by the Reservoir of Bustards founded in 1975 are of significant interest. The National Park mainly focuses of the open-air protection of the birds. The bustard raising plant is only open for the endangered birds. The eggs are placed in the incubator of the Bustard Plant but the young birds are returned to nature.