Mynydd Epynt

Mynydd Epynt (Welsh: [ˈmənɨð ˈɛpɨnt]) is an upland region of Mid Wales, within the county of Powys. It is bounded on the south by the upper stretch of the Usk Valley, on the north by the Irfon Valley, and on the east by the Wye Valley. Its western boundary is less distinct but lies east of the A483 Llandovery to Llanwrtyd Wells road. The area is an extensive plateau lying between 400 and 450 metres (1,300 and 1,500 ft), drained by several southward-flowing rivers that empty into the River Usk; these include (from west to east) the Cilieni, the Nant Bran, the Afon Ysgir (with its two headwaters, the Ysgir Fechan and Ysgir Fawr) and the Afon Honddu. The Duhonw drains north-eastward into the River Wye. The highest point is a marilyn (having topographic prominence of at least 150 m (490 ft)) of 478 m (1,568 ft). Since 1940, Mynydd Epynt has formed part of the Sennybridge Training Area, the largest military training zone in Wales.