WMO Hydrological Observing System (WHOS) Phase I
WHOS Phase I provides a map interface displaying information on National Hydrological Services (NHSs) around the world including:
- links to their websites;
- when available, links to their historical observations and/or real-time data published online without restrictions or cost.
This map interface was published online in 2015 and is updated on a regular basis.