The River Dun, also known as the Glendun River (in Irish: Abhann Duinne, brown river) is a river in County Antrim, Northern Ireland. It runs through Glendun, one of the nine Glens of Antrim. The river is named after its brown colour, which comes from the peat bogs at its source on the slopes of Slievenanee on the Antrim Plateau. The source of the river is a few hundred metres from that of the River Bush, which flows north-east to meet the sea at Bushmills. Cushendun (Bun Abhann Duinne, "foot of the River Dun" in Irish[1] – although the English name derives from Cois Abhann Duinne, "beside the River Dun") is a small coastal resort town lying at the mouth of the River Dun and Glendun.