Did You Know? The Black Canyon stretches far beyond the 14 miles within the national park. Including the canyon within Curecanti National Recreation Area and Gunnison Gorge National Conservation Area, the total length is 53 miles. Blue Mesa Reservoir which is the largest body of water in Colorado and stretches approximately 30 miles with almost 100 miles of shore line and is the start of The Black Canyon of the Gunnison.  The area surrounding  these areas has world class hunting and fishing with some of Colorado finest four wheeling, ATV and hiking trails.