Nouns denoting natural objects (not man-made)
- bolt-hole
- a hole through which an animal may bolt when pursued into its burrow or den
- Carlsbad Caverns
- a group of caverns in southeastern New Mexico noted for their stalactites and stalagmites
- Mount Sinai
- a mountain peak in the southern Sinai Peninsula (7,500 feet high); it is believed to be the peak on which Moses received the Ten Commandments
- pinetum
- an area planted with pine trees or related conifers
- indument
- a covering of fine hairs (or sometimes scales) as on a leaf or insect
- Pyrenees
- a chain of mountains between France and Spain
- viral delivery vector
- a transducing vector that uses a retrovirus
- Isere River
- a river in southeastern France; a tributary of the Rhone
- Pavo
- a small constellation near the South Pole between Tucana and Ara
- Grand Canyon
- the enormous gorge of the Colorado River in northern Arizona
- clast
- (geology) a constituent fragment of a clastic rock
- cow dung
- a piece of dried bovine dung
- Bay of Bengal
- an arm of the Indian Ocean to the east of India
- anion
- a negatively charged ion
- Mohawk River
- a river of central New York that flows southeastward to the Hudson River
- Elbe River
- a river in central Europe that arises in northwestern Czechoslovakia and flows northward through Germany to empty into the North Sea
- Lena River
- a Russian river in Siberia; flows northward into the Laptev Sea
- backwater
- a body of water that was created by a flood or tide or by being held or forced back by a dam
- Oder River
- a European river; flows into the Baltic Sea
- Lake Keuka
- a glacial lake in central New York; one of the Finger Lakes
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