1. For adding oceans, lower your terrain until it goes below groundwater. You can also use the flood tool to raise the water level or create lakes.
  2. Do not use “water” as a terrain, like stone or grass. It’s never what you need.
  3. For large rivers, lower terrain as you would for oceans. We call those “ocean-level rivers”; they have the advantage of being easy to make, and players can navigate them with vanilla ships.
  4. For rivers that go from high-to-low or that are very small (creeks), refer to FAQ “Rivers” (Advanced technique).
  5. Set your project’s ocean level carefully. There is no way to change it afterward.
  6. Use level 62 to be compatible with vanilla chunks surrounding your map (no border).
  7. Force your map border to level 31 (?) to be compatible with the ocean floor of vanilla chunks (TODO verify number).

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