River Monnow

The River Monnow is a 42-mile-long river that forms part of the England-Wales border, flowing through southwest Herefordshire and eastern Monmouthshire. It rises in the Black Mountains of Wales and flows southwards, meeting its largest tributary, the River Dore, before turning southwards and joining the River Wye near Monmouth. The river is known for its brown trout population, which has improved in recent years due to conservation efforts. Additionally, the river has a hydroelectric power scheme that generates electricity from its flow. The Monnow Valley Walk, a 40-mile-long hiking trail, follows the river. The river's name "Monnow" comes from the Welsh "Myn-wy", translating to "swift water".learn more on wikipedia