Fossilised coral that was used for the fort construction, Portuguese Fort, Kilwa, Tanzania. Author and Copyright Alan Sutton..

Fossilised coral that was used for the fort construction, Portuguese Fort, Kilwa, Tanzania. Author and Copyright Alan Sutton..

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Fossilised coral that was used for the fort construction, Portuguese Fort, Kilwa, Tanzania. Author and Copyright Alan Sutton..

Fossilised coral that was used for the fort construction, Portuguese Fort, Kilwa, Tanzania. Author and Copyright Alan Sutton..

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