Learn Croatian: Otišli su na zabačenu lokaciju gdje nitko ne živi. - They went to a remote location where nobody lives.

While you probably first learned gdje as a question word meaning "where?", here it acts as a relative pronoun. It connects the main clause to a relative clause that describes a place (...gdje nitko ne živi). English does exactly the same thing with the word "where".

Why does the sentence use na zabačenu lokaciju instead of u zabačenu lokaciju?

The noun lokacija generally pairs with the preposition na. Even though it might translate to "to" or "into" in English, Croatian often treats concepts like a "location," "site," or "address" as points on a map rather than enclosed containers, so they take na. It is in the accusative case here because the verb shows motion towards the location.

I see nitko ne živi. Why is there a double negative?

In Croatian, when you use a negative pronoun like nitko (nobody) or ništa (nothing), the verb must also be negative. This is a strict rule of double negation. You literally have to say "nobody doesn't live" (nitko ne živi) for the sentence to be grammatically correct.

What is the dictionary form of zabačenu, and where does the word come from?

The dictionary form (nominative masculine singular) is zabačen. It is an adjective that means remote, isolated, or tucked away. It is related to the verb zabačiti (to throw behind), giving it the colorful literal sense of a place that is thrown far off the beaten path.