viaje.
Do you know how to use a dictionary? Google Translate?
there's also a perfectly good category in this site called LANGUAGES.
(Apparently, Johnny doesn't get it...Reise is GERMAN. And nouns in German are ALWAYS capitalized.).
As others have told you, viaje. It comes from the verb Viajar which is the infinitive verb, to travel.
un viaje.
reise
As in the noun, not the verb?
