BGS GeoIndex (onshore)
bgs.ac.uk
Free (verified)
British Geological Survey map viewer for geology, boreholes and more.
- Best for
- Surveyors and engineers doing site desk studies.
- Cost
- Map viewer 'free to use'; data under OGL (stated on page).
- Category
- Free UK data and portals
- Source
- bgs.ac.uk · checked 15 Oct 2026
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