File:Undular bore Araguari River-Brazil-USGS-bws00026.jpg

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Summary

Description at USGS website:
"<a href="https://en.wikipedia.org/wiki/Undular_bore" class="extiw" title="w:Undular bore">Undular bore</a> and <a href="https://en.wikipedia.org/wiki/tidal_bore" class="extiw" title="w:tidal bore">whelps</a> near the mouth of <a href="https://en.wikipedia.org/wiki/Araguari_River_(Amap%C3%A1)" class="extiw" title="w:Araguari River (Amapá)">Araguari River</a>, Brazil. View is oblique toward mouth from airplane at approximately 100 ft. altitude. Portion published as Figure 5 in <a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="w:United States Geological Survey">U. S. Geological Survey</a>, Circular 1022, 1988."
Note: This undular bore (locally known as <a href="https://en.wikipedia.org/wiki/pororoca" class="extiw" title="w:pororoca">pororoca</a>) is on the Araguari River in the <a href="https://en.wikipedia.org/wiki/Amap%C3%A1" class="extiw" title="w:Amapá">Amapá</a> state in north-eastern Brazil, see <a href="https://en.wikipedia.org/wiki/Tidal_bore#South_America" class="extiw" title="w:Tidal bore">w:Tidal bore#South America</a>. The bore propagates from left to right, against the stream of the river current.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:13, 6 January 2017		5,964 × 3,970 (12.16 MB)	127.0.0.1 (talk)	<i>Description at USGS website</i>:<br>"<a href="https://en.wikipedia.org/wiki/Undular_bore" class="extiw" title="w:Undular bore">Undular bore</a> and <a href="https://en.wikipedia.org/wiki/tidal_bore" class="extiw" title="w:tidal bore">whelps</a> near the mouth of <a href="https://en.wikipedia.org/wiki/Araguari_River_(Amap%C3%A1)" class="extiw" title="w:Araguari River (Amapá)">Araguari River</a>, Brazil. View is oblique toward mouth from airplane at approximately 100 ft. altitude. Portion published as Figure 5 in <a href="https://en.wikipedia.org/wiki/United_States_Geological_Survey" class="extiw" title="w:United States Geological Survey">U. S. Geological Survey</a>, Circular 1022, 1988."<br><i>Note</i>: This undular bore (locally known as <a href="https://en.wikipedia.org/wiki/pororoca" class="extiw" title="w:pororoca">pororoca</a>) is on the Araguari River in the <a href="https://en.wikipedia.org/wiki/Amap%C3%A1" class="extiw" title="w:Amapá">Amapá</a> state in north-eastern Brazil, see <a href="https://en.wikipedia.org/wiki/Tidal_bore#South_America" class="extiw" title="w:Tidal bore">w:Tidal bore#South America</a>. The bore propagates from left to right, against the stream of the river current.

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