Ostrav is the name of the continent the campaign will primarily take place on. It is somewhat crescent shaped, and very large (though the exact size is unknown to all except perhaps the halflings, who won’t share that information). It is surrounds by the Sea of Emnity.
A general overview is as follows. The northern edge is very unforgiving and covered in the Flaming Mountains. The southern edge, inside of the crescent, contains the human port cities. The western edge is rumored to be the home of the elves, though no one has seen an elf in centuries. To the east there is the Berling Swamp, home of the Anuraians. The center of the continent is dominated by the wasteland.
An map of Ostrav can be found here.