In Fijian mythology, Murimuria is part of the underworld. After a soul dies, it is judged by Degei. A few go to Burotu, and the rest are thrown into a lake. They eventually sink to the bottom, Murimuria, and are rewarded and punished appropriately.
References
T. Williams, J. Calvert, Fiji and the Fijians, Heylin, 1858.