Map sheet number OL23 in the OS Explorer map series is the ideal partner for walks & rides around the Cadair Idris & Bala Lake area of Snowdonia National Park. The mountain range of Cadair Idris is popular with hikers & people looking for challenging terrain to explore. Highlights of the area include: Minffordd Path, Talyllyn lake, Llyn Tegid, Dol Idris, & 8 000 year old oak woods. With this map you will receive a code for use on your i OS or Android smartphone or tablet. Find our more at Mobile Download FAQ.