Located in Northern Virginia, Fairfax is a bustling suburban city with a humid subtropical climate. Summers are hot and humid while winters are cold and sometimes snowy. The city is situated in the Potomac River watershed, and the water quality is regularly monitored. The Occoquan Reservoir, an important source of drinking water for the area, is located nearby. Outdoor recreation opportunities include visiting the Fairfax County Park Authority's many parks and trails, including the popular Burke Lake Park, the W&OD Trail, and the Great Falls Park. Visitors can also enjoy golfing, boating, fishing, and hiking in the area.