Scale Force is the highest waterfall in the Lake District, not the highest above sea level, but the one with the greatest single drop. The falls as a whole are made of a series of separate falls, the highest of which measures 170 ft.
Like many other waterfalls in Lakeland this one is found in a tree filled gorge created over thousands of years. The easiest place to reach the falls from is Buttermere, over Scales Bridge and along the side of Crummock Water for a short distance.
I'm lucky enough to have an original copy of Thomas West's 1770s book - A Guide to the lakes in Cumberland, Westmorland and Lancashire where he describes Scale Force as:
"Just in front, between Blea-Crag and Mellbreak (two spiral hills) the hoarse resounding noise of waterfall is heard across the lake, concealed between the bosom of the cliff, through which it has forced its way, and when viewed from the foot of the fall is a most astonishing phenomenon"