Which river defines the western boundary of the Black-Handed Tamarin's home range in the state of Pará?

Answer

The Xingu River

The Black-Handed Tamarin's home range in Pará is strictly defined by the Amazon River to the north, the Tocantins River to the east, and the Xingu River to the west.

Which river defines the western boundary of the Black-Handed Tamarin's home range in the state of Pará?
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