You've got to be careful when producing a brand mark with a thin profile line, doubly so when it's not for a fashion brand, but Mairi Timoney balances this challenge well by keeping the hill mark at a large enough size in application that it doesn't disappear.

Plus there's always bonus points for using contour lines as a supporting pattern.

Pentland Pursuits Branding

Source: Pentland Pursuits Branding