Question

which mountain range makes the northeastern border of spain?
the alps
the sierra nevadas
the rockies
the pyrenees

Explanation:

The Pyrenees is a mountain range that forms a natural border between Spain and France, specifically on the northeastern side of Spain. The Alps are in central Europe (not bordering Spain), the Sierra Nevadas are in the United States, and the Rockies are also in North America.

Answer:

the Pyrenees