Hydrography is one of the branches of physical geography that studies the Earth's surface waters, covering rivers, oceans, lakes, seas, glaciers, etc..
In almost every country in the world there are hydrographic services. You hydrographers, professionals engaged in studying the planet's hydrography, analyze and catalog navigable waters around the world, drawing up charts and maps showing, in detail, the formation of the channels, the depth of the waters and the location of the channels, sandbanks, ocean currents and etc. Hydrographers are also responsible for studying the influence of winds on the rhythm of water and tides.
The Earth is made up of 97% water, concentrated mainly in oceans and seas. In total, the water contained on the planet covers a volume of approximately 1,400,000,000 km³.
The Pacific Ocean is the largest in extension and depth, with more than 179,700,000 km² in area and 11,020 meters in depth. The longest river, in turn, is the Amazon, with 10,245 km in length.
Hydrography of Brazil
Some of the largest hydrographic complexes in the world are in Brazil, being known for holding the largest reserve of fresh water on the planet - approximately 8% of all fresh and fresh water on Earth is on the surface Brazilian.
Therefore, the Brazilian territory is characterized by large extensions of watersheds, that is, sets of rivers, lakes and other interconnected portions of water. The Amazon River Basin is the largest in Brazil and the world.
See also the Types of maps.
