 The Caura is a Blackwater river, like the Caroní, the Ventuari River and the upper Orinoco.The Caura is wide at Musinacio (Musiú Ignacio ), the point where it joins the Orinoco, wide at this point.Satellite images in the Intertropical Zone show an interesting lack of clouds above the biggest rivers, such as the Caura and Orinoco, and also in the Amazon river.