Worldwide
Global Volcanism Program
The Smithsonian's map and database of the world's volcanoes and eruptions
volcano.si.eduOpen
Geology, Terrain & Ocean Floor
These maps show the ground itself: what rocks lie beneath your feet, how high and steep the land is, what soils cover it, where minerals and fossils are found, and the hidden landscape of the ocean floor.
18 maps · 18 completely free
Worldwide
Macrostrat
Geologic map of the whole world, combining hundreds of maps
macrostrat.orgOpen
Worldwide
Ancient Earth Globe
See where your town was on Earth hundreds of millions of years ago
dinosaurpictures.orgOpen
Worldwide
OpenTopoMap
Free topographic map of the world from OpenStreetMap and elevation data
opentopomap.orgOpen
Worldwide
River Runner
Follow a raindrop from anywhere to the sea
river-runner-global.samlearner.comOpen
Worldwide
topographic-map.com
Free elevation and topographic maps for anywhere
en-us.topographic-map.comOpen
Worldwide
VolcanoDiscovery
Volcano news, active volcano map and earthquake reports
volcanodiscovery.comOpen
Great Britain
BGS Geology Viewer
Geology of Britain from the British Geological Survey
geologyviewer.bgs.ac.ukOpen
Worldwide
OneGeology Portal
Geological maps from geological surveys around the world in one viewer
portal.onegeology.orgOpen
United States
USGS MapView
Browse every published geologic map of the United States
ngmdb.usgs.govOpen
Worldwide
Flood Map (floodmap.net)
Elevation map that shows what floods at a given water level
floodmap.netOpen
Worldwide
Mindat
The mineral database, with maps of where minerals are found
mindat.orgOpen
Worldwide oceans
NOAA Bathymetric Data Viewer
Seafloor depth and bathymetry surveys from NOAA
ncei.noaa.govOpen
Worldwide
OpenTopography
High-resolution lidar and elevation data, searchable on a map
opentopography.orgOpen
Worldwide
PBDB Navigator
Map of fossil finds through time, on ancient continents
paleobiodb.orgOpen
Worldwide
SoilGrids
Global maps of soil properties at 250-metre resolution
soilgrids.orgOpen
United States
Web Soil Survey
Official US soil maps and reports for any area
websoilsurvey.nrcs.usda.govOpen
Japan
Seamless Digital Geological Map of Japan
Japan's nationwide 1:200,000 seamless geological map
gbank.gsj.jpOpen
No maps match this filter.
How to choose
For geology anywhere, start with Macrostrat; for official detail, use national geological surveys (BGS, USGS, GSJ).
For elevation, simple tools give a quick answer, while OpenTopography provides lidar data for serious work.