Arauca is a department of Eastern Colombia located in the extreme north of the Orinoco Basin of Colombia, bordering Venezuela. The southern boundary of Arauca is formed by the Casanare and Meta Rivers, separating Arauca from the departments of Casanare and Vichada. To the west, Arauca borders the department of Boyacá. The Caño Limón oil fields located within Arauca account for almost a third of the Colombian oil output. Its capital is the town of Arauca.

The Meta River is a major left tributary of the Orinoco River in eastern Colombia and southern Venezuela, South America. The Meta originates in the Eastern Ranges of the Andes and flows through the Meta Department, Colombia as the confluence of the Humea, Guatiquía and Guayuriba rivers. It flows east-northeastward across the Llanos Orientales of Colombia following the direction of the Meta Fault. The Meta forms the northern boundary of Vichada Department, first with Casanare Department, then with Arauca Department, and finally with Venezuela, down to Puerto Carreño where it flows into the Orinoco.