The Josias River Watershed drains 7.4 square miles in portions of York and Ogunquit, Maine. It includes the main stem of the Josias River, Josias, Clay Hill and Muddy Brooks, and numerous small ponds and wetlands. The wetland includes portions of large forest blocks and scattered agricultural land, as well as areas of high value habitat for endangered and threatened wildlife, and rare plants. Several small parcels of private conservation land are located at the headwaters of the watershed. The main stem of the river is 5.75 miles long and drops 220 feet, as it runs east to its mouth at Perkins Cove. The majority of the landscape in the Josias River Watershed is undeveloped forestland. The areas of highest development are concentrated near the coast and along Route 1.