Which two countries do the Parima Mountains separate?

Parima Mountains, Spanish Sierra Parima, Portuguese Serra Parima, range in northern Brazil and southern Venezuela. It is an outlying range of the Guiana Highlands and extends south-southeastward for about 200 miles (320 km), separating Venezuela from Brazil. Its peaks, largely unexplored, reach an elevation of 5,000 feet (1,500 metres) above sea level.

They form the divide between the watersheds of the Amazon and the Orinoco. All the water on their western side drains into the Orinoco, which rises itself in the Parima Mountains as well. All the water on their eastern side drains into the Branco River, which ultimately empties into the Rio Negro, which in turn empties into the Amazon.

The Parima Mountains belong to the settlement areas of the Yanomami.