From Halopedia, the Halo wiki
Ruuht is one of the two supercontinents on the Kig-Yar homeworld of Eayn, the other being Ah'lomet. It is home to the mainline Jackal subspecies, known as the Ruuhtians.
During the ancient Kig-Yar gladiatorial era, Kig-Yar would hold inter-clan physical combat competitions in the largest population centers on the continent. The pseudo-governments of Eayn that have administrative control of the two continents often held divergent opinions about which continent controls the smaller islands between the two. This was an attempt by the continent's "government" to ensure that Ruuht was Eayn's largest land mass.