The Carhan River flows through the rugged and scenic landscape of County Kerry in southwest Ireland, draining into the Kenmare River estuary near Cahersiveen on the Iveragh Peninsula. This intimate Atlantic salmon and sea trout river is characteristic of the wild, spate-driven waterways of the Kerry coast — short, fast-flowing, and intimately connected to the rhythms of rainfall and tidal influence. The river's catchment draws from the mountainous terrain of the peninsula, giving it the classic character of a western Irish spate river: clear, peaty-tinged water running over rocky substrate, with pools, runs, and riffles carved through a dramatic glacially-shaped valley. Its proximity to the Atlantic means the river responds quickly to rainfall events, which are frequent in this part of Ireland, and these spates are what trigger fish runs from the sea.