Okay, coordinates for the one I found (and has undoubtedly been found by others) is at -700, -120. It's within sight of someone's settlement at -540, 140 ish, that person has a lot of animals in pens, a fairly large complex that's starting to look good, but their Nether portal isn't active, and I couldn't find any signs saying who they are.
Second, Depth Strider is amazing! Holy crap, why didn't I enchant my boots with this sooner? This is going to make slime hunting so much more fun. I've got a second book with it, if anyone is interested. It makes moving through the water so much easier. This is one of those enchantments you don't want to live without.[DOUBLEPOST=1410995642,1410995246][/DOUBLEPOST]Here's where the Monument is on the map:
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I don't even know what those are.
Ocean Monuments are the new Jungle/Desert Temple, only this time they're more well guarded. They are underwater buildings that appear in deep enough oceans, and contain some cool and dangerous stuff. They're guarded by powerful fish monsters called Guardians, the premium version of which, the Elder Guardian, afflicts you with mining fatigue, so it's really hard to just dig your way in.
Rewards to be found include: Sponges, Sea Lanterns, Prismarine blocks, etc.