The lower section of the Susquehanna River Water Trail from York Haven to Safe Harbor follows a river that reflects the places and people of Pennsylvania's heartland and forms an integral part of the Chesapeake Bay Gateways and Susquehanna River Greenway networks. The Susquehanna Greenway is a land- and water-based recreational corridor of open space and scenic byways, while the Chesapeake Bay Gateways Network is a partnership system of over 20 water trails and 120 parks, refuges, museums, and historic sites in the Chesapeake watershed. Along this route, forested upper reaches give way to renowned agricultural lands in the Lancaster-York Heritage Region, wide shallow river sections, historic river towns, and large reservoirs formed by the four hydroelectric dams at York Haven, Safe Harbor, Holtwood, and Conowingo in Maryland. Area attractions include the historic Old Columbia-Wrightsville Bridge, Chickies Rock, and Conejohela Flats, an internationally renowned bird habitat, while river towns such as Columbia, Wrightsville, and Marietta actively promote their commerce, unique heritage, and recreation opportunities.