The mountains of Whernside (736 m or 2,415 ft), Ingleborough (723 m or 2,372 ft) and Pen-y-ghent (694 m or 2,277 ft) are collectively known as theThree Peaks. The peaks, which form part of thePennine range, encircle the head of the valley of the River Ribble in the Yorkshire Dales National Park in the North of England.