The Shadowlands are a region encompassing nearly half of the planet Dusk, called such due to the permanent night caused by the planet's rotational period. As the planet is tidally-locked and therefore the Shadowlands in constant shadow, the region is extremely cold and untraversable. It is predominantly covered in a think sheet of ice; what precipitation the area receives is exclusively snow, although precipitation ceases entirely approximately 500 miles from the border of the Shadowlands, rendering the majority of the area a desert.
The simplified border of the Shadowlands is ~250 miles away from the meridian (the exact center of the Dusk). The true border of the Shadowlands follows geographic lines, such as the top of the Vestroen mountain ranges west of Evenheim. The western side of the Vestroen range is cast in shadow from the mountains and therefore is considered part of Shadowlands despite being slightly east of the simplified border. In some areas, the Dusk extends past the simplified border due to low elevation (no topographical shadows) and a more temperate climate due to ocean currents. For example, the coastal city of Iridesa is technically in the Shadowlands and is much darker than the rest of the Dusk, but is still considered a Duskland city due to its "warmer" average temperature (24°F).
Although only theoretical, there is a supposition that in the center of the Shadowlands is a second storm similar to the Gale, albeit much smaller and with a counter-clockwise rotation (from above). The reasoning goes that as the winds of the Gale circle the planet and meet in the Shadowlands they create a vortex. However, this theory does not take into account the Coriolis effect of the planet's rotation, which may prevent a true mirror of the Gale from forming in the Shadowlands. Verification of this theory has never been possible as travel into the depths of the Shadowlands is even more dangerous than into the Galelands due to the extreme cold and pitch darkness.