High Quality Content by WIKIPEDIA articles! Ingleborough is the second highest mountain in the Yorkshire Dales. It is one of the Yorkshire Three Peaks, the other two being Whernside and Pen-y-ghent. Ingleborough is frequently climbed as part of the Yorkshire Three Peaks Challenge, which is a 24-mile (38-km) circular challenge walk starting and finishing in Horton in Ribblesdale. If done anti-clockwise Ingleborough is the last mountain climbed, and ascent is from Chapel-le-Dale.