Why not try and find it on a map? Zoom in and have a look for yourself. De-Graft visit Snowdon, the tallest mountain in Wales, to explore what a mountain is and how they’re formed by tectonic ...

My name's Seren and today I'm exploring the UK's tallest mountains. I'm in Wales on my way up a mountain called Pen Y Fan, which is Welsh for top spot. And it really is. It's the tallest mountain ...