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100

the elevation of an object in relationship to a given plane, often sea level 

altitude

100

a rock that breaks the waves; a wave that breaks against a rock, a sand bank, or the shore, exhibiting a white foam

breakers

100

an arm of the sea; a straight or narrow sea between two continents or between a continent and an isle

Channel

100

a steep, rugged rock; a rough, broken rock or point of a rock

crag

100

a low place between hills; a vale or valley 

dale

200

an arm of the sea, extending into the land, smaller than a gulf and larger than a creek

bay

200

a small natural stream of water; a current flowing from a spring

brook

200

a cone-shaped hill of volcanic material surrounding an opening in the earth

cinder cone

200

the edge of a continent that is submerged in water 

continental shelf

200

a low place between hills; a vale or valley 

crater

300

soft, wet ground covered with grass or other plants, too soft to bear a man

bog

300

a long deep hollow with steep, rocky sides worn by a stream or torrent of water

canyon

300

a cleft or fissure in the rock or the earth’s surface caused by a disrupture

chasm

300

a small inlet or bay; a recess in the sea shore 

cove

300

a flowing or passing of water; a stream 

current

400

a soggy, swampy, slow-moving body of water, obstructed by vegetation

bayou

400

a head land; the head, point, or termination of a neck of land, extending some distance into the sea beyond the common shore

cape

400

a deep, naturally hollow place in the earth, deeper than a cave

cavern

400

the edge or margin of the land next to the sea; the seashore

coast

400

a small inlet; a recess in the shore of the sea or of a river; a small stream 

creek

500

a high bank, almost perpendicular, projecting into the sea

bluff

500

the edge, margin, or border of a steep place, as of a precipice or the bank of a river 

brink

500

a high, steep almost vertical rock, usually on a coast 

cliff

500

any tract of land or inhabited land; any region, as distinguished from other regions; a kingdom, state, or lesser district

country

500

land prepared for crops

cultivated land