There is a total of 4 continents with several maps in each one.
Not all continents were released in any version of LO and by the looks of it, not every continent will be released in the latest LO, more likely in a content update.
It is a HUGE world.
Maps in the same continent are connected and open world.
Other continents require transportation such as ships, teleports, or even the giant penguins in the sky according to trailers.
From Blue Coral map, you travel down a cave to Louran Desert, and can continue to Al Sarvana.