Enns (river) below the Enns"). Finally, it meets the Danube at Mauthausen and the city of Enns. The Enns is a typical wild water river and draws its water from an area of more than , which is the fifth-largest in Austria. The average outflow at its mouth is . The Anisian Age in the Triassic Period of geological time is named from Anisus, the Latin name of the river Enns. In the middle of the 19th century, canals began to be built along the between Weißenbach and the Gesäuse, in order to make use of the water for agriculture and forestry.
Citizens United to Protect the Maurice River and Its Tributaries, Inc. report by the National Wild and Scenic River Study states that “[t]he study area functions as critical migration-related habitat for shorebirds, songbirds, waterfowl, raptors, rails and fish. The Maurice River and its tributaries drain the Southwest portion of the Pinelands National Reserve, which is also an International Biosphere Reserve under the United Nations Man and Biosphere Program.” The New Jersey Landscape mapping indicates the Maurice River watershed as habitat for bald eagles, waterfowl, and several other migratory birds. In addition, the area contains the world’s largest population of "Aeschynomene virginica", (sensitive joint vetch). Its NatureServ Conservation Status is G2, globally