Set in the stunning mountain valleys of the Snowdonia National Park, Bala is a quaint village covered by OS Landranger map 125. It provides a range of activities including water sports on the natural Bala Lake. Lake Vyrnwy is situated just outside the National Park amidst the remote Berwyn Mountains. You can explore the 24, 000 acre RSPB Reserve & walk through the Sculpture Park below the dam. 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 Landranger map for Bala & Lake Vyrnwy is available in both the standard paper version & weatherproof " Active" version.