Lagan (lăgˈən) [key], river, c.40 mi (60 km) long, rising in Slieve Croob, SE Northern Ireland. It flows NW, then NE past Lisburn to Belfast Lough at Belfast. The port of Belfast and its shipbuilding yards are located at the mouth of the Lagan; a canal joins the river to Lough Neagh.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.