USA/CO: Black Canyon of the Gunnison NP
Black Canyon of the Gunnison National Park is one of the deepest canyons in the world, the narrow gorge of the Gunnison River has walls dropping nearly 3,000 feet in an almost vertical fashion. In fact, it’s called “black” not only because of the color of its metamorphic rock, but also because some of the bottom sections receive only around 33 minutes of sunlight a day. Almost all viewpoints are staring down into an insane abyss from the rim, with the Gunnison River gurgling down at the bottom (the river drops at an average of 34 feet per mile, making it the fifth steepest river in America). The park contains about 12 miles of the deepest part of the canyon.