Catharpin is a small unincorporated community in northern Virginia, located between Gainesville and Manassas. The climate in Catharpin is considered humid subtropical, with hot summers and mild winters. The area is characterized by rolling hills and forests with numerous streams and creeks, including the Broad Run and Cedar Run watersheds. Water quality in these streams is closely monitored due to concerns about high levels of nutrients and sediment from agricultural runoff. Outdoor recreation opportunities in the area include hiking, camping, and fishing at nearby parks such as Bull Run Regional Park and Manassas National Battlefield Park.