@openstreetmap/id-tagging-schema/data/presets/natural/water/reservoir.json

The OpenStreetMap tagging model used by the iD editor

{
    "icon": "maki-water",
    "geometry": [
        "area"
    ],
    "tags": {
        "natural": "water",
        "water": "reservoir"
    },
    "reference": {
        "key": "water",
        "value": "reservoir"
    },
    "name": "Reservoir"
}