[1] The Mirning's traditional lands covered, according to Norman Tindale, roughly 39,000 square miles (100,000 km2) of territory, reaching from Point Culver[a] eastwards across to White Well in South Australia.
Their northern limit was generally the ecological line separating them from the beginning of the karst plateau of the Nullarbor Plain, though good rains would see them penetrating further north.
[1] The Mirning were, according to measurements made of old people from a remnant of the tribe in 1939, relatively short in stature and practice rites of circumcision and subincision.
For ceremonial rites, involving the tribe's adoption of circumcision and subincision, the Wonunda-mirnung and Jirkala-mirning would gather at Jadjuuna, just south of Cocklebiddy.
[6][d] Alfred William Howitt describes the tribe's marriage system as "very peculiar", in which two classes (Būdera and Kūra) have a privileged position as follows:[6] In December 2022 it was reported that the 30,000 year old artwork lining the Koonalda Cave at Nullarbor, sacred to the Mirning, was severely damaged by vandals who wrote graffiti over part of the surface.