Definition of rough bounds in US English:

rough bounds

noun

Scottish
  • With the (now usually with capital initials): (the name given to) the rugged, inaccessible part of the western Scottish Highlands between Loch Hourn in the north and Loch Shiel in the south.

Origin

Early 19th century. After Scottish Gaelic Garbh-chrìochan, lit. ‘the rough boundaries’.