Galicate

I'm working on an RPG like server, and I want to make the world size limited so that my team and I may fill it with custom structures, bosses, events, and other stuff before the server officially opens. Something like 30k x 30k world size. Is it possible to pre-generate the entire world, and also autofill someones map so that we may see where things are? We want a couple of massive continents, so we expect to generate many worlds to get what we need.