Nouns denoting natural objects (not man-made)

Inland Sea
an arm of the Pacific Ocean in southern Japan; surrounded by the islands of Honshu and Shikoku and Kyushu and linked to the Sea of Japan by a narrow channel; the chief port is Hiroshima
 
Aconcagua
the highest mountain in the western hemisphere; located in the Andes in western Argentina (22,834 feet high)
 
Pisces
a large faint zodiacal constellation; between Aquarius and Aries
 
pit
a sizeable hole (usually in the ground)
 
Colorado River
a river in Texas; flows southeast into the Gulf of Mexico
 
Galway Bay
a bay of the North Atlantic on the west coast of Ireland
 
Gulf of Oman
an arm of the Arabian Sea connecting it with the Persian Gulf
 
Forth River
a river in southern Scotland that flows eastward to the Firth of Forth
 
urinary calculus
a calculus formed in the kidney
 
Lyra
a small constellation in the northern hemisphere near Cygnus and Draco; contains the star Vega
 
hollow
a depression hollowed out of solid matter
 
sky
the atmosphere and outer space as viewed from the earth
 
lowland
low level country
 
Danube River
the 2nd longest European river (after the Volga); flows from southwestern Germany to the Black Sea
 
fragment
a piece broken off or cut off of something else
 
Clyde
a river in western Scotland that flows from the southern uplands into the Firth of Clyde; navigable by oceangoing vessels as far as Glasgow
 
fire pit
a pit whose floor is incandescent lava
 
base
the bottom or lowest part
 
rock
a lump or mass of hard consolidated mineral matter
 
relict
geological feature that is a remnant of a pre-existing formation after other parts have disappeared
 
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