The Lehigh Valley is an area of eastern Pennsylvania encompassing Lehigh and Northampton Counties. Included are the cities of Allentown, Bethlehem, and Easton, surrounding smaller towns, and rural and undeveloped areas. The Valley is bounded on the east by the Delaware River and on the north by the Kittatinny Ridge. The Lehigh River runs roughly north-south through the western part of the region, then turns sharply and flows roughly west-east to join the Delaware River. Geography consists of rolling hills forming foothills to the Appalachian Mountains. Areas of tree cover are largely deciduous, with some coniferous forest primarily at the higher elevations. There are no natural lakes and few wetlands, but there are several human-made lakes.