Vichada Structure
{{Infobox terrestrial impact site
| name = Vichada Structure
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| photo = Vichada Structure LC08 L1TP 005057 20160118 20170405 01 T1.jpg
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| photo_caption = 2016 Landsat image of the Vichada Structure
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| confidence = Probable
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| country = Colombia
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File:Vichada Structure Skylab G40B091120000.jpg image of the Vichada Structure]]
The Vichada Structure is a probable impact structure along the Vichada River in Colombia (Vichada Department), South America. It is most likely the largest impact structure in South America.[http://www.planetary.org/blogs/guest-blogs/amir-alexander/20100213vichada.html Planetary Society Researcher Max Rocca Discovers Largest Impact Crater in South America], A Target Earth update by Amir Alexander, February 13, 2010, retrieved 25 May 2017
{{coord|4|30|N|69|15|W|format=dms|display=title|name=Vichada}}
The structure was discovered in 2004 by Max Rocca, a geologist in Buenos Aires, by examining Landsat imagery. He was supported by a grant from the Planetary Society. The structure consists of a central flat depression surrounded by two concentric rings of hills of approximately 30 and 50 km diameter. The Vichada River anomalously flows around the outer ring of hills. An international team of scientists collected aerial gravity data over the 50 km wide structure and discovered a positive free-air anomaly at the center of the structure, supporting its interpretation as an impact structure.Hernandez, O., et al., 2009, Geophysical evidence for an impact crater in Vichada, northwestern South America, and its economic potential, Earth Sci. Res. J., Vol. 13, No. 2 (December 2009): 97-107