Marsh Creek State Park is a 1,705 acres (690 ha) Pennsylvania state park in Upper Uwchlan and Wallace Townships, Chester County, Pennsylvania in the United States. The park is the location of the 535-acre (217 ha) man-made Marsh Creek Lake. With an average depth of 40 feet, the lake is stocked with fish and is a stop for migrating waterfowl. Marsh Creek State Park is 2 miles (3.2 km) west of Eagle on Pennsylvania Route 100. Park road hours 8:00 am until sunset. All other access open 24 hours.

Chester County, colloquially referred to as Chesco, is a county in the Commonwealth of Pennsylvania. It is located in the Delaware Valley region, located in the southeastern part of the state. As of the 2020 census, the population was 545,823(As of 2022), increasing by 7.1% from 498,886 in 2010. The county seat is the Borough of West Chester. The most populous of its 73 municipalities is Tredyffrin Township. The most populous boroughs are West Chester and Phoenixville. Coatesville is the only municipality in the County organized under the City form of government, a technical rather than demographic distinction. Chester County was one of the three original Pennsylvania counties created by William Penn in 1682. It was named for Chester, England. The county is part of the Southeast Pennsylvania region of the state.