Click on the regions on the map to zoom in and locate the mountains.
The regions, with their names and numbering are taken from The Relative Hills of Britain by Alan Dawson.
HuMPs are hills of any height with a drop of 100 metres or more on all sides The name HuMP stands for HUndred Metre Prominence.
By definition, all Marilyns qualify as HuMPs (but not vice versa).
A subHuMP is a hill which just fails (by up to 10m) to
qualify on the drop rule, i.e. drop of 90m to 99m on all sides.
(HuMPs appear as Class=Hu on this website, or Ma if also a Marilyn, and subHuMPs appear as Class=sHu).
The official e-book listing all the Humps, compiled by Mark Jackson, is now available for free download:
More Relative Hills of Britain (the Humps e-book, 12MB beware!).
The book divides the hills into "Topo Regions" (see the book for definition) - you can view the HuMPs by Topo Region here.