Obtrusch is a Bronze Age round cairn on Rudland Rigg, positioned so it looks on the skyline from round about. It has kerb stones and a central cist; nearby to the southeast there’s another smaller cairn.
It used to be known as Obtrush Rook (or Roque) in the nineteenth century – the Home of Hobthrush. Hobthrush was of course a hob (like a brownie) – the other part of the name may come from ‘thurs’ which is an old english word for a devil or giant.