an Entity references as follows:
The Xingu River (/ʃiːŋˈɡuː/ sheeng-GOO; Portuguese: Rio Xingu, Portuguese pronunciation: [ʃĩˈɡu]; Mẽbêngôkre: Byti, [bɯˈti]) is a 1,640 km (1,019 mi) river in north Brazil. It is a southeast tributary of the Amazon River and one of the largest clearwater rivers in the Amazon basin, accounting for about 5% of its water.