File:Deep Oceans Overview.png

Summary
The dark blue areas are deep oceans. The blue veins through the land are rivers

Source: https://twitter.com/notch/status/104255190806433794 https://imgur.com/lCKwM https://www.reddit.com/r/Minecraft/comments/jmw29/based_on_the_screenshot_and_on_notchs_statement/c2dfkbf/?context=999