Mynydd y Drum is a hill on the border between the county of Powys and Neath Port Talbot County Borough, south Wales. The summit of the hill is in Neath Port Talbot (formerly the county of Glamorgan) at 298m and lies towards the western end of a broad curving ridge, the larger part of which is in Powys (former county of Brecknockshire). The eastern half of the hill is currently being opencasted for coal. The hill is sometimes referred to simply as The Drum (a Welsh word, so pronounced 'drim').