Wild swimming walks Eryri / Snowdonia: 28 river, lake & waterfall days out in North Wales by Emma Marshall is a guidebook combining hillwalking with wild swimming across the Eryri (Snowdonia) national park. It details twenty-eight routes, ranging from roughly three to ten miles, that lead walkers to secret valleys, hidden waterfalls, alpine pools, and woodland gorges carved by cascading water, including highlights such as the glacially carved Nant Ffrancon Valley, the Rhaeadr Ddu waterfall in the Afon Prysor gorge, and Llyn Cau on the slopes of Cadair Idris. Each walk comes with directions, photographs, and maps, along with safety guidance for swimming in open water, making it a practical companion for anyone wanting to explore North Wales's mountains and waterways together.