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Explanation for Mount Sineru: While reading this it is understood the name Sineru Mountain is the same Mahameru Mountain.
It cannot see for laymen human being eyes. But those who attain "Dhyana" can visit and see these places through there supreme wisdom.
Chakkavala is 31 levels under the One Sun and Moon. Yes According to Lord Buddha there can be infinite Chakkavala.
Chakkavala is part of universe.
Understand the Universe: Explanation for Universe