High barriers built to hold back floodwaters of a river or a lake.

the height of the land over sea level (the level of the ocean)

a low area between mountains or hills

shows the higher and lower parts of an area; they often use different colors and textures to display information.

show a place at a particular time in history.

low, flat land near the ocean

an area of land at the foot of a mountain range

1.
relief map

2.
elevation

3.
piedmont

4.
coastal plain

5.
valley

6.
historical map

7. levee(s)