{"geometry":{"type":"MultiPolygon","coordinates":[[[[-4.809964,50.365178],[-4.809772,50.365198],[-4.809506,50.365237],[-4.809465,50.365245],[-4.80943,50.36526],[-4.809395,50.365279],[-4.809405,50.36529],[-4.809448,50.365312],[-4.809572,50.365354],[-4.809768,50.365416],[-4.809808,50.365425],[-4.809887,50.365428],[-4.810014,50.365422],[-4.810138,50.365412],[-4.810247,50.365398],[-4.810368,50.365372],[-4.810406,50.36536],[-4.810419,50.365353],[-4.810433,50.365343],[-4.810432,50.365334],[-4.810428,50.365328],[-4.81041,50.365319],[-4.810316,50.36528],[-4.810208,50.365228],[-4.810162,50.365212],[-4.810079,50.365193],[-4.809972,50.365178],[-4.809964,50.365178]]]]},"type":"Feature","properties":{"entry-date":"2026-08-20","start-date":"","end-date":"","entity":14500768,"name":"Wheal Martyn SSSI","dataset":"site-of-special-scientific-interest","typology":"geography","reference":"1001085","prefix":"site-of-special-scientific-interest","organisation-entity":501910,"quality":"authoritative"}}