ANSWERS: 2
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No. Satellites have mapped all land, including even islands that are occasionally (usually: regularly) submerged. * The only "undiscovered islands" would be those that rise suddenly (typically from volcanic action), and they would remain undiscovered only for the (relatively brief) time between their emergence and their detection by people and/or satellites.
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No the satellites have looked over every bit of the planet by now. 5/3/26
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