Map sheet number 253 in the OS Explorer series covers the Lleyn Peninsula on the west coast of Wales. This Area of Outstanding Natural Beauty & be explored by walking the length of the Llyn Coastal Path & taking in Caernarfon Bay & Cardigan Bay. 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. The OS Explorer map for Lleyn Peninsula West is available in both the standard paper version & weatherproof ' Active' version.