Ordered by the number of climbs recorded. About rhyolite.
| Crag | Location | # Climbs |
|---|---|---|
| Rhiw Goch Boulders | United Kingdom / Wales / Conwy Principal Area / Dolwyddelan | 2 |
| Black Crag | United Kingdom / England / Keswick | 2 |
| Craig y Clipiau | United Kingdom / Wales / Blaenau Ffestiniog | 2 |
| Mallory Boulder | United Kingdom / Wales / Caernarfon | 2 |
| Cwm Cneifion | United Kingdom / Wales / Bangor | 2 |
| Wasdale Screes | United Kingdom / England / Cumberland / Seascale | 2 |
| Y Lliwedd | United Kingdom / Wales / Caernarfon | 2 |
| Langstrath | United Kingdom / England / Keswick | 2 |
| Bidean nam Bian | United Kingdom / Scotland / Ballachulish | 2 |
| Clogwyn y Ddysgl | United Kingdom / Wales / Caernarfon | 2 |
| Craig y Rhaeadr | United Kingdom / Wales / Caernarfon | 2 |
| Ettws Isaf | United Kingdom / Wales / Caernarfon | 2 |
| Black Wall | United Kingdom / England / Keswick | 2 |
| Uig Sea Cliffs | United Kingdom / Scotland / Na h-Eileanan an Iar / Isle of Lewis | 2 |
| Buachaille Etive Mor | United Kingdom / Scotland / Ballachulish | 2 |
| Drws y Gwynt | United Kingdom / Wales / Caernarfon | 2 |
| Langdale Boulders | United Kingdom / England / Westmorland and Furness / Ambleside | 2 |
| Low Raven Crag | United Kingdom / England / Westmorland and Furness / Ambleside | 1 |
| Deer Bield Crag | United Kingdom / England / Westmorland and Furness / Ambleside | 1 |
| Stonestar Crag | United Kingdom / England / Broughton-in-Furness | 1 |