{"geometry":{"type":"MultiPolygon","coordinates":[[[[-0.255264,52.931984],[-0.255259,52.932005],[-0.255269,52.932014],[-0.256483,52.932464],[-0.257012,52.93162],[-0.257035,52.931603],[-0.257053,52.931601],[-0.257256,52.931616],[-0.258333,52.929832],[-0.256859,52.929363],[-0.256047,52.930684],[-0.255264,52.931984]]]]},"type":"Feature","properties":{"entry-date":"2026-06-11","start-date":"","end-date":"","entity":13903321,"name":"Roman saltern in Helpringham Fen","dataset":"scheduled-monument","typology":"geography","reference":"1004962","prefix":"scheduled-monument","organisation-entity":16,"quality":"authoritative","documentation-url":"https://historicengland.org.uk/listing/the-list/list-entry/1004962"}}