Fetching details from the dictionary...

to be; to exist; to live
to have
to be located
to be equipped with
to happen; to come about
to exist (in a completed state); to be (something unchanged in its current state)
鍵がどこに在るか分からない。
I don't know where the key is.
駅の近くにいい店が在る。
There's a good shop near the station.
何か問題が在れば遠慮なく言ってくださいね。
If there's any problem, please don't hesitate to say so.