River Lugg River Lugg The River Lugg () rises near Llangynllo, Powys. It flows through the border town of Presteigne, Wales then through Herefordshire, England, to the south of Leominster where it meets a tributary, the River Arrow. Its confluence with the River Wye is at Mordiford, downstream of Hereford and from its source. Below Leominster the river was made navigable under the "River Wye & Lugg Navigation Act 1696" for improving the River Wye, and had pound locks. Despite several attempts to improve it, including making flash locks against bridges, the river was probably never a satisfactory navigation. Commercial navigation probably
River Wye river from Redbrook to Chepstow forms the border between England and Wales. The River Wye forms two Sites of Special Scientific Interest, one covering the Upper Wye ("Gwy Uchaf") above Hay-on-Wye, and one covering the Lower Wye ("Gwy Isaf") downstream to Chepstow. The criteria for inclusion of the river as an SSSI include geology, topography, flora, mammals, invertebrates, fish and birdlife, as the river and its tributaries constitute a large linear ecosystem. The Lower Wye SSSI is itself divided into seven units of assessment set by Natural England, and administrative responsibilities are shared between the county authorities of Powys, Herefordshire,