Translation of "Arch" in Spanish

So let's go back to Mesa Arch,

Así que volvamos a Mesa Arch,

Led by his arch-rival, Pompey Magnus.

guiadas por su archirival, Pompey Magnus.

The sunrise illuminates the bottom of the arch orange,

El amanecer ilumina el fondo del arco naranja,

A rainbow is a seven-colour arch in the sky.

Un arco iris es un arco de siete colores en el cielo.