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Regionally Important Geological and Geomorphological Site
Introduction
There's a handy writeup on Naturenet.
A bit of searching reveals a few site listings.
The RIGS Handbook is now only available online.
OpenLayers
Some Records Centres manage data, for example BRERC RIGS (login required).
A Wales dataset (2022) is available. This is loaded up.
Attribution: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Other data are available on data.gov.uk, but they are not comprehensive. None are loaded up yet.
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