Nouns denoting natural objects (not man-made)

Indigirka River
a river in far eastern Siberia that flows generally northward to the Arctic Ocean
 
Prudhoe Bay
a bay on the northern coast of Alaska where oil was discovered in 1968
 
Guaira Falls
a great waterfall on the border between Brazil and Paraguay
 
Cumberland River
a river that rises in southeastern Kentucky and flows westward through northern Tennessee to become a tributary of the Ohio River in southwestern Kentucky
 
Firth of Forth
a large firth on the east coast of Scotland and the estuary of the Forth River; location of Edinburgh
 
Colorado River
a river in Texas; flows southeast into the Gulf of Mexico
 
Tigris River
an Asian river; a tributary of the Euphrates River
 
flume
a narrow gorge with a stream running through it
 
graviton
a gauge boson that mediates the (extremely weak) gravitational interactions between particles
 
Io
the closest of Jupiter's moons; has active volcanoes
 
Atlas Mountains
a mountain range in northern Africa between the Mediterranean and the Sahara Desert; extends from southwestern Morocco to northern Tunisia
 
Milk River
a river that rises in the Rockies in northwestern Montana and flows eastward to become a tributary of the Missouri River
 
Libra
a small faint zodiacal constellation in the southern hemisphere; between Virgo and Scorpius
 
Moon
the natural satellite of the Earth
 
lunar crater
a crater on the Earth's Moon
 
mackerel sky
a sky filled with rows of cirrocumulus or small altocumulus clouds
 
shoal
a stretch of shallow water
 
celestial body
natural objects visible in the sky
 
Magellanic Cloud
either of two small galaxies orbiting the Milky Way; visible near the south celestial pole
 
the Alps
a large mountain system in south-central Europe; scenic beauty and winter sports make them a popular tourist attraction
 
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