The Culdaff River is a medium-sized spate river, ranging from 5 to 20 meters in width, flowing directly into the Atlantic Ocean near Malin Head on the Inishowen Peninsula in County Donegal — Ireland's most northerly point. As a spate river, its flows are closely tied to rainfall, and fish runs are heavily influenced by water levels. The river empties into the stunning V-shaped Culdaff Bay, forming a small estuary behind the sand dunes before crossing the beach and entering the sea at the western end. This estuary zone, where freshwater meets saltwater, is a key transitional habitat that draws both migratory sea trout and salmon, as well as estuarine species like mullet and bass. The surrounding landscape is one of dramatic coastal beauty, with golden beaches, rocky headlands, and the wild character of the Inishowen Peninsula providing a memorable backdrop for any angling trip.