Mission Viejo sits in southern Orange County as a planned community built around Lake Mission Viejo, a man made lake that anchors recreation and neighborhood life. Lake Mission Viejo offers boating, swimming, and lakeside concerts in summer, while Oso Creek Trail winds through the city with paths for walking, running, and cycling. The Saddleback Valley and nearby Santa Ana Mountains frame views from hills and parks, giving the city a scenic backdrop that residents enjoy daily.