Nouns denoting natural objects (not man-made)

break
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
 
Lake Albert Nyanza
a shallow lake on the border between Uganda and Congo in the Great Rift Valley
 
Solway Firth
a large firth on the west coast of Britain between England and Scotland
 
bank
sloping land (especially the slope beside a body of water)
 
Kodiak Island
an island off southern Alaska in the Gulf of Alaska; site of the first European settlement in the area which was founded by the Russians in 1784
 
sanitary landfill
a low area where waste is buried between layers of earth
 
Caspian Sea
a large saltwater lake between Iran and Russia fed by the Volga River; the largest inland body of water in the world
 
antiquark
the antiparticle of a quark
 
Omega Centauri
a global cluster in the constellation Centaurus
 
Delaware River
a river that rises in the Catskills in southeastern New York and flows southward along the border of Pennsylvania with New York and New Jersey to northern Delaware where it empties into Delaware Bay
 
open chain
a chain of atoms in a molecule whose ends are not joined to form a ring
 
Aquarius
a zodiacal constellation in the southern hemisphere; between Capricornus and Pisces
 
anthill
a mound of earth made by ants as they dig their nest
 
drumlin
a mound of glacial drift
 
stub
a small piece
 
Antarctic Ocean
the southern waters surrounding Antarctica
 
Deimos
the outer of two small satellites of Mars
 
elevation
a raised or elevated geological formation
 
tarn
a mountain lake (especially one formed by glaciers)
 
charm quark
a quark with an electric charge of +2/3 and a mass 2900 times that of an electron and a charm of +1
 
  List More