How to Say "mountain range" in Spanish
The Spanish word for “mountain range” is “sierra” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
nounA1
A long chain of mountains

Examples
Viajamos a la sierra para hacer senderismo el fin de semana.
We traveled to the mountain range to go hiking on the weekend.
La Sierra Madre es un sistema montañoso muy extenso en México.
The Sierra Madre is a very extensive mountain system in Mexico.
Gender Rule
Even though 'sierra' ends in -a, it is always a feminine noun, so you must use 'la' or 'una' before it.
Confusing Noun Meanings
Mistake: “Usar 'sierra' cuando se quiere decir 'montaña' (a single mountain peak).”
Correction: 'Sierra' refers to a whole range or chain of mountains, not usually a single peak. Use 'montaña' for one mountain.
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