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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