page_title: River Lagan
section_title: The Lagan Navigation
hierarchical_section_title: River Lagan / The Lagan Navigation
caption_attribution_description: English: The River Lagan in Northern Ireland passing beneath an old three arched stone bridge at Drumbeg.
context_page_description: The River Lagan is a major river in Northern Ireland which runs 53.5 miles from the Slieve Croob mountain in County Down to Belfast where it enters Belfast Lough, an inlet of the Irish Sea. The River Lagan forms much of the border between County Antrim and County Down in the east of Ulster. It rises as a tiny, fast-moving stream near to the summit of Slieve Croob; Transmitter Road runs nearby. It runs to Belfast through Dromara, Donaghcloney and Dromore. On the lower slopes of the mountain, it combines with a branch from Legananny Mountain, just opposite Slieve Croob. The river then turns east to Magheralin into a broad plain between the plateaus of Antrim and Down.
  The river drains approximately 609 square km of agricultural land and flows over 70 km from the Mourne Mountains to the Stranmillis Weir, from which point on it is estuarine. The catchment consists mainly of enriched agricultural grassland in the upper parts, with a lower section draining urban Belfast and Lisburn. There is one significant tributary, the Ravernet River, and there are several minor tributaries, including the Carryduff River, the River Farset and the Blackstaff River.
context_section_description: In the late 19th century the Lagan Navigation was built from Lough Neagh to Belfast, using some of the river as a navigable waterway and diverting water from other areas to supply separate canal sections. However, by the mid-20th century the route had fallen into disuse and was largely derelict. The M1 motorway (Northern Ireland) was built across the route. Currently, the section of the navigation's towpath running from Lisburn to almost the centre of Belfast has been restored.
caption: The Lagan at Drumbeg.
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