Lake Quannapowitt is one of two main lakes in Wakefield, Massachusetts, the other being the manmade Crystal Lake. Lake Quannapowitt is a popular setting for walkers, joggers, bikers, and in-line skaters off Route 128 in Middlesex County. It is the site of many organized races from 5Ks to Ultra Marathons. Since 1992, Friends of Lake Quannapowitt is an organization that has worked to fulfill its goal of promoting public awareness and providing long-term protection and enhancement of Lake Quannapowitt and its environs. Large amounts of tar were found in the lake some years ago.