# Isochrones: how far you get in a given time

> /isochrone returns the area reachable from a point within a time or a distance, as GeoJSON contour lines or polygons, in Valhalla’s body. Service areas and delivery zones are drawn from it. On Berlin the GeoJSON was byte-identical to Valhalla 3.9.1 on 45/45 isochrones.

Status: In development, not deployed: there is no routing endpoint to call yet, on geolith.app or api.geolith.app, and no routing plan, price or key.

## Isochrones (/isochrone) against Valhalla 3.9.1, Berlin

| Set | Requests | Byte-identical |
| --- | --- | --- |
| Isochrones | 45 | 45/45 |

## Request

One location, a costing, and contours by time (minutes) or distance (kilometers). polygons returns filled areas instead of lines; reverse gives the area that can reach the point.

- contours: up to several times or distances in one request.
- polygons, denoise and generalize, as in Valhalla.
- reverse: the area from which the point can be reached.

Request shape (no hosted endpoint):

```bash
curl -X POST "https://ROUTER_HOST/isochrone" \
  -H "Content-Type: application/json" \
  -d '{
    "locations": [{ "lat": 52.5163, "lon": 13.3777 }],
    "costing": "bicycle",
    "contours": [{ "time": 10 }, { "time": 20 }],
    "polygons": true
  }'
```

## Response

A GeoJSON FeatureCollection, one feature per contour, ready to draw with MapLibre.

## Sources

1. [Routing API (planned)](https://docs.geolith.app/routing/api), geolith docs (read 2026-11-08)
2. [Valhalla turn-by-turn API reference](https://valhalla.github.io/valhalla/api/turn-by-turn/api-reference/), Valhalla (open source, MIT) (read 2026-11-08)

Routing is in development and not deployed; there is no endpoint to call yet, and no routing plan, price or key. Read the routing docs: https://docs.geolith.app/routing