On Dragon Earth they are known as The Dead Lands. Spots on the world where nothing lives. Where nothing can live, for swiftly and steadily all life is leached out, until the organism expires; and sometimes arises again as undead.
There are magics against this, but even the most puissant fail under the eldritch assault.
The largest of the Dead Lands is found in Southeast Asia. It encompasses the old republics of Vietnam, Laos, and Cambodia. Plus about half of the Kingdom of Thailand, the northern third of the Malaysian Penninsula, and the southern third of the Empire of China.
Elsewhere Dead lands take up a few hundred square miles at most, with the great majority spread across a few acres. In each case staying in the area of a Dead Land without protection is fatal at best.
In the United States probably the largest stretch of Dead Land is found along the Mississippi River, where the city of St. Louis once stood.
It is possible to bring the land back to life, but it is hard work, with lots of set-backs. At times a Dead Land can even expand its boundaries; but with the destruction of the Lich King this happens less and less frequently as time passes.
Currently the U.S. and the Chinese Empire are making the most progress against the Dead Lands. Officially the Russian Republic is also making strides, but reports are coming out of Russia that the Dead Lands there are actually expanding at an increasing rate.
Then you have the ghost lights of Chickamaugua. When the stars are right the spectral sounds of ghostly armies can be heard fighting in a Chickamaugua suburb. Which puzzles people no end, since the Dragon Earth version of the United States had no Civil War. Slavery was abolished in 1820 and the former slaves, human and non-human alike, either moved away, or integrated into local society. (The last city to have segregated facilities was Boston MA, and those were done away with under the administration of President Jefferson Davis (1857-1865). The current theory is that it's some sort of 'bleed over' from an alternate Earth.