Editing Orography (section)

==Uses==
Mountain ranges and elevated land masses have a major impact on [[global climate]]. For instance, the elevated areas of [[East Africa]] substantially determine the strength of the [[Monsoons#Northern Indian Ocean Monsoon|Indian monsoon]].<ref>Srinivasan, J., Nanjundiah, Ravi S. and Chakraborty, Arindam (2005). [http://hdl.handle.net/2005/76 "Impact of Orography on the Simulation of Monsoon Climate in a General Circulation Model"]. Indian Institute of Science.</ref> In scientific models, such as [[general circulation model]]s, orography defines the lower boundary of the model over land.{{Citation needed|date=January 2009}}

When a river's [[tributaries]] or settlements by the river are listed in 'orographic sequence', they are in order from the highest (nearest the source of the river) to the lowest or [[mainstem (hydrology)|mainstem]] (nearest the mouth).{{Citation needed|date=January 2009}} This method of listing tributaries is similar to the [[Strahler Stream Order]], where the headwater tributaries are listed as category&nbsp;1.