the world's most spectacular roads

Marchlyn Mawr Dam

Marchlyn Mawr Dam is a natural lake dammed to form a reservoir at an elevation of 643m (2,109ft) above the sea level, located in Gwynedd, in north-west Wales. It’s one of the highest mountain roads of the country.

The road to the summit, in Snowdonia, a mountainous region in north west Wales, is asphalted but pretty narrow. The road to the reservoir is owned by the power/water company and closed to cars. Starting from Tyddyn Dicwm, the ascent is 10.1 km long. Over this distance, the elevation gain is 546 meters. The average percentage is 5.4 %. The maximum gradient is 12.0%.


Pin It

Roads global map


Share YOUR roads!
We've more than 13.000 roads but we want more! We want your experiences too! Do you know anyspectacular road?Click here to send us all the info, and we'll publish it!


Seguridad de la página de inicio