Check out this fantastic drone video of the Wichita Mountains, in the USA's Great Plains state of Oklahoma. The mountains are located in the southwestern part of the state, east of the panhandle. The mountains consist of a series of rocky cliffs and promontiries formed by a geological phenomenon known as a failed continental rift. The area is home to the Wichita Mountains Wildlife Refuge, a popular backpacking and hiking area that covers almost 240 square km (a bit under 100 square mi.).