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In general, I think the answer is "no"; buoyancy simply doesn't work that way, and you'd need to somehow circumvent buoyancy. What might be plausible is to have a low spot in your terrain that is ...
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#1: Attribution notice removed
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System
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2020-12-01T17:59:13Z (about 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/168424 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/