Answer :

That is false because the river is in the middle of Uruguay while Montevideo is at the edge of Uruguay.

Answer: the sentence is false.

Explanation: The sentence says:

"Montevideo is located in the Uruguay river"

Montevideo is located in the south of the country, while the Uruguay river is more at the west, and goes almost along the border with Argentina, starting at the rio de la plata.

So the sentence would be false,