Sea level.
Pennsylvania's highest point, Mount Davis, is 3,213 feet (979 meters) above sea level. Pennsylvania's lowest point, the Delaware River at the Delaware state border, is actually at sea level
Sea level at the point the Delaware River exits the state.
the highest point of Delaware is 442 feet above sea level on Ebright in New Castle County.the lowest point in Delaware is sea level along coast.
Delaware river
Delaware
California is the state that contains the lowest point of elevation at Badwater Basin in Death Valley at 282 feet below sea level. Louisiana Ranks second with a point that is 8 feet below sea level. Delaware is the state with the lowest average elevation at 60 feet above sea level.
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Delaware
the lowest point is the trough .:)