Editing Lehigh County, Pennsylvania (section)

===Topography===
{{See also|Blue Mountain (Pennsylvania)|South Mountain (Eastern Pennsylvania)}}
Lehigh County borders two [[Appalachian Mountains|Appalachian]] mountain ridges. To the north, the county borders [[Blue Mountain (Pennsylvania)|Blue Mountain]], which has an altitude of {{convert|1300|to|1604|ft}}. To the south, it is bordered by [[South Mountain (Eastern Pennsylvania)|South Mountain]], which has an altitude of {{convert|700|to|1100|ft}} and cuts through the southern portions of both Lehigh and Northampton counties. The Lehigh County's highest point is near [[Germansville, Pennsylvania|Germansville]] at [[Bake Oven Knob]], a mass of [[Tuscarora Sandstone|Tuscarora]] [[Conglomerate (geology)|conglomeratic]] rocks that rise about {{convert|100|ft}} above the main Blue Mountain ridge in northwestern [[Heidelberg Township, Lehigh County, Pennsylvania|Heidelberg Township]].<ref>{{cite book |last=Miller |first=Benjamin LeRoy |title=Lehigh County Pennsylvania: Geology and Geography | year=1941 |publisher=Department of Internal Affairs, Commonwealth of Pennsylvania | location=Harrisburg, Pennsylvania}}</ref>

Lehigh County is part of the [[Delaware River]] [[Drainage basin|watershed]]. Most of the county is drained by the [[Lehigh River]] and its tributaries, though the [[Schuylkill River]] also drains regions in the county's south through [[Perkiomen Creek]] and in the county's northwest through [[Maiden Creek]].