{
    "fields": [
        "material",
        "seamark/type"
    ],
    "moreFields": [
        "{man_made}"
    ],
    "geometry": [
        "line",
        "area"
    ],
    "tags": {
        "man_made": "groyne"
    },
    "aliases": [
        "Wing Dam",
        "Wing Dyke",
        "Spur Dyke"
    ],
    "name": "Groin"
}