Den Helder (Marsdiep)
Neptun covers Den Helder (Marsdiep) (Netherlands) through the Rijkswaterstaat network. One GET request returns its readings as JSON — in the same shape as every other network Neptun serves, so you write the parsing once.
Source: Rijkswaterstaat · Position: 52.9644, 4.7450
Values at build time
| water level | 0.59 m |
Snapshot taken at build time: 14.09.2026 09:50 UTC. Query the API for live values.
Request
curl -H "Authorization: Bearer mapi_YOUR_KEY" \
"https://neptun.marine-api.com/v1/levels?lat=52.9644&lon=4.7450&radius=5"