The most important of these waterways is of course river IJssel; others include the Zwarte Water and (Overijsselse) Vecht rivers; the Regge stream, which flows through Twente to spend its last few kilometers in Salland before ending in the Vecht near Ommen; the Schipbeek stream; and the Soestwetering stream, which merges with a number of lesser streams near Zwolle to form river Zwarte Water.