sentences:  It receives the Garnock river at its north-west extremity, and communicates by a narrow mouth or strait with the Firth (previously Frith) of Clyde.The course of the Irvine is recorded as having shifted in an old Eglinton Estates document, a map recording the previous course with a note that the water left the old riverbed in 1758.This altered the confluence of the River Irvine with the Annick Water.