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The tributaries of the Tocantins, called the Maranhao and Parana-tinga[?], collect an immense volume of water from the highlands which surround them, especially on the south and south-east.
Between the latter and the confluence with the Araguay, the Tocantins is occasionally obstructed by rocky barriers which cross it almost at a right angle.
The flat, broad valleys, composed of sand and clay, of both the Tocantins and its Araguay branch are overlooked by steep bluffs.
Tocantins forms the boundary between the Amazon Rainforest and the coastal savanna.
As with much of Brazil, Tocantins' economy is dependent on cattle raising, though the state's pineapple plantations not only supply much of Brazil with the fruit, but also many other Mercosul nations with it too.
The federal government, seeking to broaden Tocantins' economic horizons by funding the construction of a hydroelectric dam in the state, allowed a private company to construct a sizable five-turbine hydroelectric dam, blocking the Tocantins river and displacing some indigenous inhabitants.