Apparently a combined system of levitation, propulsion and guidance using magnets.
A video of the creator and river
http://www2.imperial.ac.uk/imedia/content/view/433/professor-eric-laithwaite-demonstrates-the-magnetic-river
A video of the creator and river
http://www2.imperial.ac.uk/imedia/content/view/433/professor-eric-laithwaite-demonstrates-the-magnetic-river
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A river thats magnetic, idk i never heard of them before.