The Britain and Ireland Simms classification (height over 600 m, and prominence above 30 m), is very similar to the Irish Arderin classification (height over 500 m, and prominence over 30 m). s of October 2018[ [update]], the 2,754 Simms in Britain and Ireland, which include 224 Irish Simms (i.e. the Irish Arderins over 600 m), are ranked by height, and by prominence, on this table: