Topography Like the rest of Long Island's North Shore, Port Washington North is situated on a terminal moraine, known as the Harbor Hill Moraine. This moraine was formed by glaciers during the Wisconsin Glacial Episode, and is named for Harbor Hill in Roslyn; Harbor Hill is the highest geographic point in Nassau County.
Topography Like the rest of Long Island's North Shore Port Washington North is situated on a terminal moraine known as the Harbor Hill Moraine. This moraine was formed by glaciers during the Wisconsin Glacial Episode and is named for Harbor Hill in Roslyn; Harbor Hill is the highest geographic point in Nassau County.