That water then gets pushed up onto the surface of the ground and that is what we call spring creeks and rivers. Examples of these rivers are the Sog River in the south of Iceland, the West Ranga River, the Minnivallalaekur and Galtalaekur as well as the Litla River and Laxa Myvatn River in the north. These rivers on the volcanic part of Iceland are perfect habitat for brown trout and in some cases salmon as well. These rivers are great habitat for midges (chironomidae) which are the most common food source for freshwater species of Iceland.