page_title: List of rivers of Ireland
section_title: B
hierarchical_section_title: List of rivers of Ireland / B
caption_attribution_description: English: Longfield's Bridge Carries the R621 over the Blackwater River.
context_page_description: This is an alphabetical list of the main rivers in Ireland as a whole. It includes rivers that flow through the Republic of Ireland and Northern Ireland. Rivers that flow through Northern Ireland are marked with an asterisk. There are over 70,000 km of waterways in the Republic of Ireland contained in 3,192 river water bodies including rivers, streams, and tributaries. The major rivers have their length given. Also shown are two tables. Table 1 shows the longest rivers in Ireland with their lengths, the counties they flow through, and their catchment areas. Table 2 shows the largest rivers in Ireland in cubic meters per second.
context_section_description: Baelanabrack River 11 miles (18 km)
  Baleally Stream, County Dublin
  River Ballinamallard* 16 miles (26 km)
  Ballinascorney Stream, County Dublin
  Ballinderry River* 29 miles (47 km)
  Ballinglen River, County Mayo
  Ballintotty River, County Tipperary
  Ballintra River 14 miles (23 km)
  Ballisodare River 5.5 miles (8.9 km)
  Ballyboughal River, County Dublin
  Ballycassidy*
  Ballyfinboy River 20.75 miles (33.39 km)
  Ballymaice Stream, County Dublin
  Ballymeeny River, County Sligo
  Ballynahatty*
  Ballynahinch River*  18.5 miles (29.8 km)
  Ballyogan Stream, County Dublin
  Balsaggart Stream, County Dublin
  Bandon 45 miles (72 km)
  River Bann (Wexford) 26 miles (42 km)
  Bann* 90 miles (140 km) — longest river in Northern Ireland. Upper Bann flows into Lough Neagh and then continues north as the Lower Bann.
  Bannagh*
  Barrow 119.5 miles (192.3 km)
  Bartramstown River, County Dublin
  Belderg River, County Mayo
  Bellanaminnaun River, County Mayo
  Bellawaddy River, County Sligo
  Bilboa River 19.5 miles (31.4 km)
  River Black 17.75 miles (28.57 km) County Mayo
  Blackbanks Stream, County Dublin
  Blackditch Stream, County Dublin
  Blackwater, Kerry
  River Blackwater, Kildare and Meath 20 miles (32 km)
  River Blackwater, Cavan and Meath 42.5 miles (68.4 km)
  Blackwater, Munster 104.5 miles (168.2 km)
  River Blackwater (Ulster)* 56.7 miles (91.2 km)
  Bloody Stream, Howth, County Dublin
  Boggeen Stream, County Dublin
  Boherboy Stream, County Dublin
  Boyle River (Total) 40 miles (64 km)
  River Boyne 70 miles (110 km)
  Bracken River, County Dublin
  Bracken, Balbriggan
  River Bradoge, County Dublin
  Breedoge River 11.75 miles (18.91 km)
  River Bride 40 miles (64 km) (Blackwater)
  River Bride 21 miles (34 km) (Lee)
  Bride's Glen Stream, County Dublin
  Bride's Stream, County Dublin
  Broad Meadow River, County Dublin
  Brockey Stream, County Dublin
  Broghane Stream, County Kerry
  Brook Stream, County Dublin
  Brosna 49.25 miles (79.26 km)
  Brownsbarn Stream, County Dublin
  Bungosteen River 15.5 miles (24.9 km)
  Bunowen River (Galway) 16 miles (26 km)
  Bunowen River (Mayo) 13.25 miles (21.32 km)
  Bunratty River 25 miles (40 km)
  Burntollet*
  Burren River 24 miles (39 km)
  River Bush* 33.5 miles (53.9 km)
caption: Munster Blackwater
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