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The River Lagan drains approximately 609 km2 of agricultural land and flows over
70 km from the Mourne Mountains to the Stranmillis Weir, from which point on it is estuarine. The Lagan
Wier (situated at the point where Belfast began at a ford across the river) impounds the Lagan Estuary.
This weir was completed in 1993 to improve the aesthetic and environmental quality of the estuarine
The banks of the estuary have recently been targeted as a major focus
development and investment. This development is managed by the Laganside Corporation
and their help with this monitoring program is gratefully acknowledged. Below the weir the estuary empties
into Belfast Lough - a shallow semi-enclosed marine bay on the eastern coast of Northern Ireland.