I Agree with Wayupthere
Two engines on there and if there both still turning, gain some distance from terra firma and work the problem, if your heading towards friendly ground at the same time then bonus! for me immediate landing is engine fire or other fire and aircraft(pax) in dire stress, a bit of birdie feathers on one lump of metal ill happy work the problem first before going nuts into the nearest airfield
mountain range would make me think a little more about GRO though but without all the facts cant say thats a bad decision, maybe more than enough altitude to risk flying over it single engine.