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When all the ice on earth melts, the average level of the sea will be around 200 feet higher than it is now. The Post-it notes in the photos mark where a road or other public right of way crosses the 200-foot contour in the catchment of Afon Rhyd or Afon Caseg (it seems to have two names).
The numbers under each photo are date and Ordnance Survey grid reference in the form: yyyymmdd_easting-northing.
Back to the ‘When all the ice melts’ blog post.