Editing Roraima (section)

=== Hydrography ===
[[File:Rio Branco sul.JPG|left|thumb|Branco River, near Boa Vista.]]
The state of Roraima has extensive hydrography. Its territory is abundantly irrigated by 14 rivers, being these: [[Água Boa do Univini River|Água Boa do Univiní]], [[Ailã River|Ailã]], [[Ajarani River|Ajarani]], [[Alalaú River|Alalaú]], [[Branco River|Branco]], [[Catrimani River|Catrimani]], [[Cauamé River|Cauamé]], [[Itapará River|Itapará]], [[Mucajaí River|Mucajaí]], [[Surumu River|Surumu]], [[Takutu River|Takutu]], [[Uraricoera River|Uraricoera]], [[Urubu River (Amazonas)|Urubu]] and [[Xeruini River|Xeruini]].<ref name=":10">{{Cite web|title=Aspectos naturais de Roraima - Hidrografia|url=https://brasilescola.uol.com.br/brasil/aspectos-naturais-roraima.htm|access-date=2021-04-25|website=Brasil Escola|language=pt-br}}</ref>

The hydrography of Roraima is part of the [[Amazon River Basin|Amazon River basin]] and is basically based on the Branco River sub-basin of {{convert|45,530|km2|-2|abbr=in}}, the largest and most important in the state. This river is one of the tributaries of the [[Rio Negro (Amazon)|Negro River]].<ref>{{Cite web|title=Bacias hidrográficas|url=http://www.portalroraima.rr.gov.br/index.php?option=com_content&task=view&id=92&itemid=1|archive-url=https://web.archive.org/web/20080514031247/http://www.portalroraima.rr.gov.br/index.php?option=com_content&task=view&id=92&itemid=1|archive-date=14 May 2008|url-status=dead|access-date=March 16, 2011|publisher=Portal do Governo do Estado de Roraima}}</ref>

Most of the rivers in the region have a large number of [[beach]]es in the summer, ideal for tourism and leisure. Besides, there are rapids rivers located in the north of the state, which are an option for water sports, such as [[canoeing]]. Almost all water sources in the state originate within its territory, except for two rivers with springs in [[Guyana]]. All Roraiman rivers flow into the [[Amazon basin|Amazon Basin]].<ref name=":10" />