Subject
- Airports3
- Cities and towns3
- Mines and mineral resources3
- Salt mines and mining3
- Vegetation boundaries3
- Aqueducts2
- Bridges2
- Communication2
- Contours (Cartography)2
- Dams2
- Demography2
- Electric lines2
- Electric power transmission2
- Human settlements2
- Hydrographic surveying2
- Hydrography2
- Industrial sites2
- Inland Waters2
- Lakes2
- Marine accidents2