Search:

Yes you are right. However it depends which quarry you talking about as there is one quarry closer to LI in fact it is on the same ridge/range of Snowdonia.
LM or YL are more slate and LI is...

Just to answer some of the questions.
Llyn means in English Lake.
From there you can deduct Llyn Idwal is lake on bottom uf Cwm Idwal. History says that the lake was named after one of the sons...