Perennial rivers are those rivers which exhibit a continuous flow of water throughout the year except during extreme drought. On the other hand, non-perennial rivers are those rivers which have no flow for at...

Delta is a sedimentary deposit formed at mouth of some rivers. It is usually triangular in shape. On the other hand, an estuary is a semi-enclosed body of water where fresh water meets the ocean.

England is country under the Great Britain and the United Kingdom. Great Britain comprises Wales, England and Scotland. The United Kingdom of Great Britain and Northern Ireland includes England, Wales,...

Britain is an informal term for Great Britain.

England is a country, while London is a city inside England.