Cwm Idwal is a glacial valley located in the Snowdonia National Park in Wales. It is known for its stunning natural beauty, featuring steep cliffs, a clear lake, and diverse plant life. The valley was formed during the last Ice Age and is surrounded by several peaks, including Idwal Slabs, which is popular among climbers. The area is also significant for its geological features, showcasing various rock types and formations. Cwm Idwal is a designated Site of Special Scientific Interest (SSSI) due to its unique ecology and is a popular destination for hikers and nature enthusiasts exploring the Snowdonia region.