The total length of the oceanic ridge systems is of the order of

The total length of the oceanic ridge systems is of the order of 65000 km. The massive Mid-Ocean Ridge system wraps around the globe like seams on a baseball, stretching an impressive 65,000 kilometers (40,390 miles). The majority of the system is underwater, with an average water depth to the top of the ridge of 2,500 meters (8,200 feet).