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The USA is situated in the central part of the North American continent. Its western coast is washed by the Pacific Ocean and its eastern coast by the Atlantic Ocean. The area of the USA is over nine million square kilometres. The continental part of the USA consists of two highland regions and two lowland regions. The highland regions are the Appalachian Mountains in the east, and the Cordillera and the Rocky Mountains in the west. The highest peak in the Appalachian Mountains is 2,037 metres high. The highest peak of the Cordillera in the USA is 4,418 metres. Between the Rocky Mountains and the Appalachian Mountains are the central lowlands, which are called the prairie and the eastern lowlands, called the Mississippi valley. The five Great Lakes, between the USA and Canada, are joined together by short rivers or canals, and the Saint Lawrence River joins then to the Atlantic Ocean. In the west of the USA there is another lake called the Great Salt Lake. The main rivers of the USA are Mississippi, which flows into the Gulf of Mexico, the Colorado and the Columbia which flow into the Pacific Ocean, the Saint Lawrence River and the Hudson River, which flow into the Atlantic Ocean. The USA is very large country, so it has several different climatic regions. The coldest regions are in the north and north-east where much snow falls in winder. The south has a subtropical climate. Hot winds blowing from the Gulf of Mexico often bring typhoons. The climate along the Pacific coast is much warmer than that of the Atlantic coast. The region around the Great Lakes is known for its changeable weather.