Alexandria, Virginia is a historic city located on the Potomac River. It has a humid subtropical climate with hot summers and mild winters. The city is vulnerable to storm surges and flooding due to its proximity to the river. The Potomac River also serves as the primary source of drinking water for the area, and water quality is monitored to ensure safe consumption. Outdoor recreation opportunities in Alexandria include biking and walking along the Mount Vernon Trail that runs along the Potomac River, visiting the historic Old Town and waterfront, and exploring the parks and nature preserves in the surrounding area. The city also has several marinas and offers water activities such as kayaking and sailing.