The Mocona Falls almost seems to defy logic.

The 2.4 kilometre-long waterfall forms when water levels lower along a split-level channel on the Uruguay River in Argentina, close to the border with Brazil.

The effect is of a river falling sideways — and it looks like a feature on an alien planet.

The waterfall, which is only visible for about 250 days per year, is almost 12 metres high in places.

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When the river level drops, the falls appear - in some places, the drop is as much as 12 metres. Photo / Creative Commons image by Wikimedia user Leandro Kibisz
When the river level drops, the falls appear - in some places, the drop is as much as 12 metres. Photo / Creative Commons image by Wikimedia user Leandro Kibisz

When the water levels are a bit higher, the river becomes rapids at this point.

Mocona means "that which swallows everything" — and these pictures show just why it was given such a dramatic name.

When the water rises, there are rapids at this point of the river. Photo / Creative Commons image by Flickr user Rachel Hugh
When the water rises, there are rapids at this point of the river. Photo / Creative Commons image by Flickr user Rachel Hugh