Hostile Terrain Maps
Hostile Terrain Maps for use in both sci-fi and fantasy tabletop roleplaying games. These have been prepared at 72 x 72 inches, which has also been sliced into nine 24 x 24 inch squares for use in Roll20 and other virtual tabletop applications. 24 x 24 inch 300 dpi printable PDF maps as well.
Volcanic Terrain on mountain tops and young terran planets.
Icefield/Glacier with a Crevasse.
Airless Moon - plenty of craters to show a lack of an atmosphere is more hostile than simply not allowing you to breath.
Desert Wasteland - a flat basin floor with rocky outcroppings at its edge.
Forested Swamp - clear waters could indicate a Florida environment, but for games it's better to see the depths than not.
Unseen shoals - hidden beneath the waves at low tide, exposed at high tide, these are hostile to surface watercraft, and a terrible place to be stuck...
Deep Sea Smoker - a hot spot for sulfuric gases. Though this could be at the bottom of the sea, it could also be above ground on a pre-photosynthetic young planet.
Alien Oasis, with alien soil, rocks, plants and "water". While seemingly not hostile, an oasis is frequented by local lifeforms, which may be very hostile.
Crystal Cave, another less than hostile at face value, these crystals give off harmful radiations. Those who attune themselves to the radiations can enhance magic powers with them.