The flat surface of the earth is called plains. The height of such place from sea level is on an average less than 300 mts. These are created by soil deposit from rivers. On the earth’s surface plains cover approx 50% of the total area. 

There are mainly two types of plains : 

• Coastal plains 
• Internal plains. 

(i) Coastal plains : These are found near seas and are mainly created by sea waves. They are less wide and these are good for constructing sea ports. Such as Konkan and Malabar in India. People visit these places for entertainment and they are often used for pisciculture. 

(ii) Internal plains : The plains created by deposition of fertile soil by rivers on the main land are called internal plains. Such as the plains of Ganga and Brahmputra in India . Due to high fertility of the soil, these plains are important for agriculture and because they are flat, transportation is made easy through roads and railways. Since the availability of basic necessities for living is easy, the population density is high.