Niagara River is the longest river in Madagascar. It comes straight from the constantly flowing bay of Niagara Falls. The river is claimed by Julien XIII to have the currents of the water being pushed by the falls so that it'll keep going in a continuously straight direction until all rivers meet it & it finally hits the murky depths of the swamp of Madagascar. The river also has a fault line in the middle, separating the east end of Mount Madagascar from the mainland of Madagascar.