More information about Snowdonia, Caernarfonshire (Gwynedd), North Wales.
If you intend walking in the mountains of Snowdonia you must be reasonably fit and adequately equipped. The weather in the mountains can change very quickly and you should be prepared to cope with the worst. What seems to be a well marked path in sunny weather may not be so obvious in thick cloud (mist) when you can, perhaps, see only a few yards. You should have a map and compass and know how to use them properly.
Snowdonia is divided into 3 main mountain blocks. The northern most block is the Carneddau at 3458 feet high. The central block is Tryfan and the Glyders (3250 feet high), south of the Carneddau , and separated from it by the A5 road. The southernmost block is Snowdon itself (3560 feet high) separated from the Glyders by the Pass of Llanberis.
The Ordnance Survey sheet 115, Snowdon, at 1:50,000 scale is very useful for this area.
Useful links:Routes up Snowdon
The Mountains of England and Wales