I've never heard of a mountain range referred to in singular. The Appalachian Mountains are The Appalachians. The Andes.
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Grammar GeekPerhaps California has this unique usage.Actually, it's the Spanish language that dictates that usage. sierra means (among other things) (mountain) range -- not a single mountain but a range of mountains. It's a collective noun. For example, the Appalachian Mountains form the Appalachian Range -- not Ranges.