De Biesbosch is one of the largest national parks of the Netherlands and one of the last freshwater tide areas in Europe. The Biesbosch consists of a rather large network of rivers and smaller and larger creeks with islands. The vegetation is mostly willow forests, although wet grasslands and fields of reed are common as well. The Biesbosch is an important wetland area for waterfowl and has a rich flora and fauna. It is especially important for migrating geese.