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Having a (generally) level upper surface. quotations examples
The view westwards from here is extremely fine, with the striking flat-topped outline of Blencathra or Saddleback (2,847ft) the most dominant feature, and the Helvellyn range to the left.
1961 October, ""Voyageur"", “The Cockermouth, Keswick & Penrith Railway”, in Trains Illustrated, page 598