Nouns denoting natural objects (not man-made)

a low area that has been filled in
Great Australian Bight
a wide bay of the Indian Ocean in southern Australia; notorious for storms
any agent that retards or delays or hinders
Lake Tahoe
a lake on the border between Nevada and California to the west of Carson City; a popular resort area
Volga River
a Russian river; the longest river in Europe; flows into the Caspian Sea
anything that is cast aside or discarded
Columbia River
a North American river; rises in southwestern Canada and flows southward across Washington to form the border between Washington and Oregon before emptying into the Pacific; known for its salmon runs in the spring
San Joaquin River
a river in central California that rises in the Sierra Nevada and flows northwest to form a large delta with the Sacramento River
any large deep body of water
interstellar medium
interstellar space including streams of protons moving from the stars
Housatonic River
a river that rises in western Massachusetts and flows south through Connecticut to empty into Long Island Sound
the brightest star in Gemini; close to Castor
Gulf of Tehuantepec
an arm of the Pacific in southern Mexico
Great Smoky Mountains
part of the Appalachians between North Carolina and Tennessee
cellular inclusion
any small intracellular body found within another (characteristic of certain diseases)
Saale River
a river that rises in central Germany and flows north to join the Elbe River
Vetluga River
a river in central Russia; flows generally southward into the Volga
Beaufort Sea
part of the Arctic Ocean to the northeast of Alaska
the brightest star in the constellation Lyra
a protective covering that is part of a plant
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