los dos países

the two countries

→ el
phrase Rare #42,708
the two countries Refers to two specific countries. The article and plural noun must agree.
SP: Los dos países firmaron un tratado de paz.
EN: The two countries signed a peace treaty.

Los dos países estaban unidos bajo un solo Gobierno.

The two countries were united under a single government.

Estalló una guerra entre los dos países.

A war broke out between the two countries.

Un cable submarino fue puesto en medio de los dos países.

A submarine cable was laid between the two countries.

Una guerra estalló entre los dos países.

A war broke out between the two countries.

Los dos países llegaron a un acuerdo político sobre esta disputa.

The two countries reached a political agreement on this dispute.