Sarnfic Alternate Entry Points?

So I need to get to the ocean guardian quickly, and I've heard that the waterfalls in the room near him, actually go up to the ocean floor. Is it possible to go in through those, and if so, what coords could I find them at?

 

I think you can go in there but you need to go to the actual entrance for your quest to advance to the next stage.

 

I have gone in through the main entrance, and died, and I was just wondering what the coords were for a closer entrance. Thanks anyway.