Where is Explorer Jaren?

This breadcrumb quest leads the player to discover a Scourge plot to bolster the ranks of its army with murlocs. Both the Horde and the Alliance have this questline, but the Horde version has no introduction.

Overseer Irena Stonemantle has asked you to locate her fiance, Explorer Jaren.

, my betrothed, Jaren, went west with a small group of explorers to check into rumors of artifacts on the Chillmere Coast. But there are murloc down there, and I fear the worst has befallen them.

Surely you have time to see if they're alright? There's a way down to the beach just to the southwest, though watch out for the worgs and other things lurking in the woods.

<The explorer beams a smile as you tell him who sent you. He continues in hushed tones.>

Irena was concerned about me? She gets that from her father you know.