Flowing through the heart of Anglesey, Wales, the Afon Cefni is one of the island's major rivers, stretching approximately 16.9 kilometres (10.5 miles) from its source near the village of Capel Coch to its mouth at Malltraeth Sands on the Irish Sea. The river passes through a diverse range of landscapes, from the reservoir at Llyn Cefni through the county town of Llangefni, and eventually across the flat, expansive Malltraeth Marshes before reaching the sea. This variety of habitats makes the Afon Cefni a notable destination for anglers, particularly those targeting brown trout.