The meaning of this phrase is either that the gods were plagued in their own domains, or that Jehovah had finally vanquished the Egyptians by the very element in which they were most oppressive, as when Moses himself had been exposed to drown.
"The Expositor's Bible: The Book of Exodus"
G. A. Chadwick
This was an unknown region to which they were bound, not knowing what might befall them before they reached Fumba's domains.
"In Desert and Wilderness"
Henryk Sienkiewicz
Good progress was made, but we did not forget at any time that we were invading the forbidden domains of a new polar environment.
"My Attainment of the Pole"
Frederick A. Cook