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You could use a large mid-ocean ridge, like the Mid-Atlantic ridge, and then play around with sea levels. Mid-ocean ridges occur at (divergent) plate boundaries, and can be thousands of kilometers ...
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System
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2020-06-01T14:13:54Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/102004 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/