Mile Square Regional Park Adventures

Mile Square Regional Park spans roughly 640 acres in Fountain Valley, California, situated in the heart of Orange County's urban landscape. The park's name derives from its nearly square shape, approximately one mile on each side. It features a mix of freshwater lakes, wide open green spaces, sports facilities, and natural habitat areas. Three interconnected lakes—Lakes Carolyn, Mile Square Lake, and the upper lake—form key scenic and recreational focal points within the park. The park's ecosystems accommodate a variety of local bird species, fish, and small wildlife, providing nature viewing opportunities alongside its recreational amenities. Created and developed during the 1960s on land formerly used for oil production, the park has transformed into a prime outdoor retreat for residents and visitors, managed by the Orange County Parks Department. Recreation options include walking and biking on extensive paved and dirt trails, fishing in stocked lakes, golfing at the popular Mile Square Golf Course, and using sports courts for tennis and volleyball. The park also offers picnic shelters and playgrounds, making it a favored destination for families and groups. Visitor appeal is enhanced by the accessibility, ample parking, and well-maintained facilities, allowing both casual day-users and outdoor enthusiasts to enjoy a range of activities in a serene yet easily reachable setting.