Catchment Area (river)
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the ''drainage divide'', made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern. Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, and impluvium. In North America, they are commonly called a watershed, though in other English-speaking places, "watershed" is used only in its original sense, that of a drainage divide. In a closed drainage basin, or endorheic basin, the water converges to a single point inside the basin, known as a sink, which may be a permanent lake, a dry lake, or a point where surface water is lost underground. Drainage basins are similar but no ...
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Hydrographic Basin
Hydrographics may refer to: *Hydrography, the measurement of physical characteristics of waters and marginal land *Hydrographics (printing), a printing technique for three-dimensional objects * Hydrographic Department, UK agency for providing hydrographic and marine geospatial data * Hydrographic surveys, science of measurement and description of features which affect maritime navigation, construction, dredging, oil exploration, and drilling *Atlas Hydrographic, a hydrographic and oceanographic systems company See also

*International Hydrographic Organization **List of Members of the International Hydrographic Organization {{disambiguation ...
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