The main sites where maerl has been studied in the UK and Ireland, and the locations of other maerl beds relevant to marine conservation (Loch Eriboll, Loch Sween, Strangford Lough, Milford Haven, Bantry Bay).

Studies referred to are as follows: Shetland Is. (MNCR database); Orkney Is. (Foster-Smith & Davies, 1993); Sound of Arisaig (Davies & Hall-Spencer, 1996); Clyde Sea Area (Hall-Spencer, 1995); Galway Bay and Connemara (Bosence, 1976, 1980; Keegan, 1974; Konnecker & Keegan, 1983; Maggs, 1983a, 1983b); Roaringwater Bay (Hiscock & Hiscock, 1980).