Wikipedia describes the Wainwrights 214:
Wainwrights are the 214 English peaks (known locally as fells) described in A. Wainwright's (Alfred Wainwright's) seven-volume Pictorial Guide to the Lakeland Fells (1955–66). They all lie within the boundary of the Lake District National Park in Cumbria, and all but one (Castle Crag) are over 1,000 feet (304.8 m) in height.[a] Over two million copies of the Pictorial Guideshave been sold since their publication.
Linking them all up at once requires over 500km of hiking/running.
#wainwrights214 is used on Twitter.