Corndon Hill (Welsh: Cornatyn) is a hill in Powys, Mid Wales, whose isolated summit rises to 1,683 ft above sea level. It is surrounded on three sides by the English county of Shropshire and forms a prominent landmark in the Wales-England border. Corndon's prominent western edge appears to form a separate hill and is known locally as Lan Fawr (Welsh: 'Big Hill'). It is frequented by walkers and ramblers from car parks nearby at Mitchell's Fold for example. There are spectacular panoramic views from the summit, and it is itself an important landmark for the surrounding countryside and towns like Montgomery. It is close to villages such as Church Stoke and Hyssington.