Atlanta, Georgia has a humid subtropical climate with hot summers and mild winters. The city is situated in the upper reaches of the Chattahoochee River watershed, and its hydrology constituents include the Chattahoochee River, the Flint River, and the Apalachicola River. Outdoor recreation opportunities in Atlanta include hiking and biking trails such as the Atlanta BeltLine and the Stone Mountain Trail. There are also numerous parks throughout the city, including Piedmont Park and Centennial Olympic Park. Additionally, visitors can enjoy kayaking and fishing on the Chattahoochee River or exploring the city's many historical landmarks and museums.