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"Las montañas" is a form of "montaña", a noun which is often translated as "mountain". "En" is a form of "en", a preposition which is often translated as "in". Learn more about the difference between "las montañas" and "en" below.
la montaña(
mohn
-
tah
-
nyah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (geography)
a. mountain
Escalaremos la montaña y acamparemos en la cima para despertar al amanecer.We will climb the mountain and camp at the summit to wake up at sunrise.
a. mountains
¿Qué provisiones debería comprar para acampar en la montaña?What supplies should I buy to camp in the mountains?
en(
ehn
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).