The Watershed GIS Layer delineates the boundaries of hydrologic drainage areas within York County, Pennsylvania, representing the geographic extent of surface water flow to a common outlet such as a stream, river, or lake. This dataset is derived from topographic and hydrologic data sources, typically using digital elevation models (DEMs) and hydrography. Each watershed polygon includes unique identifiers and attributes such as watershed name, Hydrologic Unit Code (HUC), drainage area (in acres or square kilometers), and receiving water body. This layer is essential for water resource planning, stormwater management, environmental protection, and land use planning. It supports applications in watershed modeling, pollution mitigation, and compliance with regulatory frameworks such as the Clean Water Act. The data is maintained in a geospatial format compatible with GIS software for integration with other hydrological, ecological, and land management datasets.