Marymoor Park, located on the north end of Lake Sammamish in Redmond, Washington, is King County's largest, oldest, and most popular park, with more than 3 million annual visitors coming to roam its 640 acres (2.6 km²). Among recreational activities available are various sports facilities, rock climbing, a 40 acre off-leash dog park and a velodrome. It is also one end of the Sammamish River Trail, a biking and walking trail.