Balrog Macula
Equatorial dark region on Pluto / From Wikipedia, the free encyclopedia
Balrog Macula /ˈbælrɒɡ/ is the largest of the "Brass Knuckles", a series of equatorial dark regions on Pluto.
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It is the largest dark equatorial feature on Pluto after the Belton Regio, and is located in the middle of the leading hemisphere.
It is named after the balrogs, a race of demons in the fiction of J. R. R. Tolkien.[1][2]