Y Marilyns

1K+
Downloads
Content rating
Everyone
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About this app

Are your ready for the challenge of climbing the 159 Welsh Marilyns (y Marilynau)? Marilyns are hills that are 150m higher than the surrounding land. Track your progress on your own personal log and with an interactive map from OpenStreetMap.

The Marilyn classification was created by Alan Dawson in his 1992 book The Relative Hills of Britain.

The Yr Marilyns app is brought to you by the Relative Hills Society.

© 2022 Doug Colton

Walk descriptions © 2022 Relative Hills Society

Base map and data from OpenStreetMap and OpenStreetMap Foundation © OpenStreetMap contributors

All images are subject to copyright or are used through Creative Commons Licence
Updated on
Oct 9, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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What’s new

Guidance on how to see the map offline
Marilyns completers info on RHSoc page