The Six Mile Water is a river in southern County Antrim, Northern Ireland. It was historically called the (river) Ollar and is known in Irish as Abhainn na bhFiodh. The Six Mile Water is an indirect tributary of the River Bann, via Lough Neagh. It rises in the hills west of Larne and north of Carrickfergus and descends gently westward, flowing through or close to the communities of Ballynure, Ballyclare, Doagh, Parkgate, Templepatrick, Dunadry and Antrim into Lough Neagh. A weir exists at Ballyclare where water was diverted to the paper mill. The Six Mile Water Park was constructed around the river in Ballyclare, in order that the river's frequent floods would not affect houses in the area. It has a catchment of 117 square miles.