Watershed boundaries
Watershed and basin boundaries, the shape of where water flows.
WaterUSGSCommercial-clean
Water field-note pins
Water - Category
Water
Water field notes, articles and basins in one view.
Commercial-clean - free to reuse, with attribution.
Open on mapWater
At a glance
Coverage (inferred)
Community
Freshness
See source
License
Mixed (see component layers)
Source
Cartian community
Provenance
Cartouche ยท Provenance
Water
Source
Cartian field notes + Wikipedia + USGS WBD
Method
Field observations contributed by people
License
Mixed (see component layers)Commercial OK
Attribution
Cartian members; Wikipedia (CC-BY-SA 4.0); USGS Watershed Boundary Dataset (public domain)
Coordinate system
EPSG:4326
Freshness
See source
Cite as
cartian:layer:cat-water@ref-38842eae
Version
vref-38842eae
Pin
As-of referencefrozen 2026-07-19
More water layers
River gauges
Live river gauges and streamflow from USGS stations.
WaterUSGSCommercial-clean
Major rivers
Curated simplified major-rivers subset served as a static app-hosted GeoJSON (public/geo/major-rivers.geojson) - zero server, cost-lean path 2. A coarse cartographic overlay of the world's principal rivers, not a precise hydrological product. Off by default, opt-in. Full HydroRIVERS network + HydroATLAS attributes are DEFER (download-only, no free hosted tiles without a tiler). Swap MAJOR_RIVERS_URL to a fuller simplified export to upgrade.
WaterHydroSHEDSCommercial-clean