CRK’s primary geographic focus begins at the river's headwaters in the north Georgia mountains above Helen and continues downstream to West Point Lake, encompassing more than 200 miles (320 km) of the Chattahoochee River and 3,600 square miles (9,300 km2) of watershed. The Chattahoochee River meets the Flint River above Lake Seminole to become the Apalachicola River in Florida. CRK is best known for its legal action against the City of Atlanta which resulted in the city revitalizing their infrastructure to address a major sewage problem, thus ensuring a cleaner river for the community.