Highest, most prominent, most isolated
Three ways to measure a hill: how high it is, how far it rises above the col linking it to higher ground, and how far away that higher ground is.
Greatest drop
Height above the key col.
Most isolated
Distance to the nearest higher summit.
Highest
Height above sea level.
Sort all 1,140 hills by any of the three in the hill finder. Guides: What prominence (drop) means, with real figures · The most isolated hills in Britain and Ireland.
Source: The Database of British and Irish Hills v18.6, CC BY 4.0. Isolation is our own calculation; see methodology.