Oceans on a Flat Earth
If the Earth is flat, why don't the oceans spill over the edge?
Flat-earthers offer several explanations but the most common is that Antarctica surrounds the entire disk of Earth as in the image below.
Common flat-earth map
In this model, Antarctica is the barrier that contains the oceans. Many flat-earthers also claim that there is an additional wall of ice that the "authorities" know about but are keeping secret from the rest of us. Exactly why an "ice wall" would be necessary on top of the existing land is unclear, although some people claim it's the wall that prevents us from exploring what's beyond.
It is often claimed that there is a secret military force stopping the public from exploring Antarctica. Given the size of Antarctica in the flat-earth model, this would be more difficult than patrolling every single land border on the other continents. No-one has explained how such a large-scale enforcement could work, or provided any evidence that it exists. In any case, we know it's not true because people do visit Antarctica, mounting expeditions across the continent including the South Pole. People travel by boat around Antarctica and have measured the distance. If the Earth was flat, the distance would be more than ten times the distance measured. If these options are too much effort, you can simply fly over Antarctica.
Of course there are numerous more problems, such as Antarctica's six-month days being incompatible with a flat Earth.
Another flat-earther explanation for the oceans is that gravity pulls them towards the middle of the disk. This ignores that fact that gravity would also pull everything else towards the center.
In summary, there is no explanation for flat-earth oceans that works.
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