The hottest and driest of the major continents, Vastashka is mostly made up of vast regions desert and grassland, with the coastal regions being the most habitable. The western coast is dominated by mountains, but the south-eastern tip of the continent is more tropical, especially near the flood plains created by several major rivers.
There is no dominant culture on Vastashka, the Draconic Empire has minor foothold along the western coast, but with no major cities the continent has been an afterthought to their expansion. In the interior desert there are many bands of nomadic Tieflings who set up camps for weeks or months at a time, but then disappear again as they move on to find trade or resources elsewhere. In the more tropical south there is a remnant of an ancient Yuan-Ti civilization, but it is hardly ever contacted by the outside world.