APURE, a river of western Venezuela, formed by the con fluence of the Sarare and Uribante at 6° 45' N. and 71° W., and flowing eastward across the Venezuelan llanos to a junction with the Orinoco at about 7° 4o' N. and 66° 45' W. Its drainage area includes the slopes of both the Colombian and Venezuelan Andes. It has a sluggish course across the llanos for about 3oom., and is navigable throughout its length. Its principal tributaries are the Caparro, Portuguesa and Guarico on the north, and the Caucagua on the south. Its lateral channels on the south mingle with those of the Arauca for many miles, forming an extensive district sub ject to annual inundations.