On November 5th, 2015, Bento Rodrigues, Brazil, was inundated in toxic sludge after a mine dam burst. See here for the full story as well as some ground level photos showing the magnitude of the disaster. More here, including a video.
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The dam that collapsed.
The area near the dam.
Over 40 km downstream the town of Barra Longa was affected too.
Wikipedia has a satellite image of the mouth of the river showing the mud reaching the Atlantic Ocean and here is a video showing it from ground level.
To see the above locations in Google Earth and to explore further download this KML file
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The JavaScript code for the ‘before and after’ effect is from here