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www.submarinecablemap.com
Discontinued Comprehensive interactive map of the world's major operating and planned submarine cable systems and landing stations, updated frequently.
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SurveyJS
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Well. Significantly more than that due to latency from switches etc and also because of the fact that there's so little land along the equator, meaning there's only one cable that travels roughly equatorially. It's from Fortaleza, Brazil to Kribi, Cameroon: https://www.submarinecablemap.com/
If you set up a bunch of good first-surface mirrors, I'm pretty sure you could get to pretty much the speed of light. You'd have to put them pretty high up in the air to avoid hitting things (a problem for cables as well, obviously) but putting the beam 2km in the air would still only lengthen the path by 4pi km, or .03%.
I have always found it very neat that the propagation speed of a light wave in glass is roughly the same as electrical waves in a coaxial cable. Both are shockingly slow compared to air/vacuum, but for completely different reasons. In both cases the advantages in signal integrity are immense.