Caernarfon from Betws-y-Coed loop — Parc Cenedlaethol Eryri / Snowdonia National Park

Prepare for a challenging road cycling adventure through the dramatic landscapes of Eryri (Snowdonia) National Park. This difficult 66.7-mile (107.3 km) loop demands very good fitness, featuring a substantial 4677 feet (1425 metres) of elevation gain over approximately 5 hours and 26 minutes. You will experience towering mountains, deep valleys, and forests, with expansive views of glacial valleys and craggy canyons. As you ride, you might catch glimpses of Snowdon and views across the Menai Strait towards Anglesey, all while navigating a mix of well-paved surfaces and more demanding sections.

This hard road ride is best suited for experienced cyclists with very good fitness levels. While the route largely features well-paved roads, be prepared for varied terrain including challenging climbs and sweeping descents. The starting point in Betws-y-Coed, known as a gateway to Snowdonia, offers a convenient base for your journey. Ensure your bike is in excellent condition and you carry enough supplies for the duration of this demanding loop.

This loop offers an immersive journey through the heart of Snowdonia, connecting the bustling hub of Betws-y-Coed with the historic town of Caernarfon, famous for its UNESCO World Heritage castle. The route showcases the diverse beauty of the national park, from coastal proximity near Caernarfon to dramatic inland mountain passes. Its length and difficulty make it a rewarding endeavor for those seeking a significant challenge amidst some of Wales' most stunning natural scenery.