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Table of Figures

1. High cliffs near Rackwick, Hoy, Orkney
2. Sandy beaches on Sanday, Orkney
3. Rocky foreshore and wave-cut bank on Westray, Orkney
4. Remains of the Broch of Borwick, Mainland, Orkney
5. Map of Orkney, showing known or potential Iron Age broch sites
6. Map of Orkney, showing all calculated pathways from the Broch of Gurness to all other known or potential broch sites
7. Comparison of lowest-energy cost paths between Gurness and Howe, under low (blue) and high (red) water-friction regimes
8. Comparison of high water-friction pathways under conditions of least-energy cost (green), highest visibility (red) and lowest visibility (blue)
9. Comparison of low water-friction pathways under conditions of least-energy cost (green), highest visibility (red) and lowest visibility (blue)
10. Detail of lowest-visibility pathways showing difference in route between low (pink) and high (purple) water-friction regimes

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