The Agivey River system is a tributary of the Lower Bann in Co L’Derry Northern Ireland. It enters the Bann about 8miles south of Coleraine and about 13 miles from the mouth of the Bann on the North coast. The Big Agivey has a fishable length of about 12 miles, and the Wee Agivey a tributary of the Big Agivey a fishable length of about 8 miles. The Big Agivey is a small to medium river ranging from about 10m wide at the mouth, 6m mid course and about 4m in the upper reaches. The Wee Agivey averages 3 to 4m for much of its length. Both rivers are described as spate rivers, rising quickly following rain and also dropping quickly. There is very little time that the river is unfishable.