coast definition geography
The coast or the coastline is the border between the land and the sea. The coasts are very important because they have many uses for humans, but they are also under threat because of humans.oasts being at the boundary of the land and the sea are extremely vulnerable to erosion. They are attacked by the immense power of the sea and the weather. Later you will look at one of the fastest eroding coastlines in the world; the Holderness coastline in NE England which is eroding at over 2 metres a year.