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The area of West Cornwall Bryophytes Site of Special Scientific Interest is 539,300.0 square meters.
SSSI stands for; Site of Special Scientific Interest.:D
There are many sites of special scientific interest around Britain these can be easily located with a clever tool on this website.
http://www.jasonwheeler.com/sssi_finder.php
hope this helps.
B.F. Skinner
They are a Special Interest Group.