For the purpose of the Mountain Leader and Winter Mountain Leader qualifications, mountainous terrain may be defined as wild country which may contain unavoidable steep and rocky ground where walkers are dependent upon themselves for immediate help. In the United Kingdom and Ireland mountainous country includes:
- Lake District
- Northwest Highlands
- Central Highlands
- Grampian Mountains (East and Central Highlands)
- Southern Highlands
- Western Highlands & Islands
- North and Far North (Scotland)
- Mountains of Mourne
- Galloway Hills
- Cork & Kerry Mountains
- Galway & Mayo Mountains
- Donegal Mountains
- Dublin & Wicklow Mountains
- Eryri / Snowdonia
- Bannau Brycheiniog / Brecon Beacons
