Nature

===Rivers===
[[File:View from Cairo Tower 31march2007.jpg|thumb|left|The [[Nile]] river in [[Cairo]], Egypt's capital city]]
{{Main|River}}
A river is a natural [[watercourse]],<ref>[http://www.merriam-webster.com/dictionary/river River {definition}] {{Webarchive|url=https://web.archive.org/web/20100221200545/http://www.merriam-webster.com/dictionary/river |date=February 21, 2010 }} from Merriam-Webster. Accessed February 2010.</ref> usually [[freshwater]], flowing towards an ocean, a lake, a sea or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including stream, creek, brook, rivulet, and rill; there is no general rule that defines what can be called a river. Many names for small rivers are specific to geographic location; one example is ''Burn'' in Scotland and North-east England. Sometimes a river is said to be larger than a creek, but this is not always the case, due to vagueness in the language.<ref>[http://geonames.usgs.gov/domestic/faqs.htm USGS – U.S. Geological Survey – FAQs] {{Webarchive|url=https://web.archive.org/web/20150701155523/http://geonames.usgs.gov/domestic/faqs.htm |date=July 1, 2015 }}, No. 17 What is the difference between mountain, hill, and [[Summit (topography)|peak]]; lake and pond; or river and [[stream|creek]]?</ref> A river is part of the [[hydrological cycle]]. Water within a river is generally collected from [[Precipitation (meteorology)|precipitation]] through [[surface runoff]], [[groundwater]] recharge, [[Spring (hydrology)|springs]], and the release of stored water in natural ice and snowpacks (i.e., from [[glacier]]s).