Pocheongyegok Valley is a representative valley of Gayasan Mountain with clear water and a lush forest. The valley used to be a learning place for local scholars in the old days. Eungwa Lee Wonjo, a civil minister and a great scholar during the late Joseon period, spent the later years of his life at Mangwijeong Pavilion located along the upper steam near a small waterfall. The beautiful valley scenery stretches over 7 kilometers.