The place is unknown.


How can I combine the following sentences by using the adjective clause?

  1. The accident happened somewhere. The place is unknown.

I’d think of: The place where the accident happened is unknown.

(An adjective clause gives you more information about a noun or pronoun that comes before it. An adjective clause begins with a relative pronoun or a relative adverb.
Relative pronouns: who whom which that whose
Relative adverbs: when why where)