Carrow was originally much lusher and greener than it is now, but some sort of ecological disaster at an unspecified time caused rivers to dry up. Carrow was originally established as an outer colony of the Unified Earth Government. Its capital was Suraka, a city which began small in an oasis but which grew larger. At some point during the war with the Covenant, Carrow emptied of colonists. In the wake of the Great Schism, Rojka 'Kaasan, a Sangheili, assembled a fleet and fled to Carrow in order to establish a new home. The result was Rak, a city built up along the banks of a hidden river in the desert. The Unified Earth Government permitted the settlement and also facilitated the reclamation of Suraka by new human colonists. Carrow was deemed to belong to a Joint-Occupation Zone. Not long after, a creaky old human ship bearing fiercely independent migrant refugees of the Human-Covenant War set its sights on Carrow, and specifically the region where Rak had been established, since it was known from old records there was a river giving life to the desert there. Upon discovering the territory was already occupied by the Sangheili, and without any hope of getting their ship in the air again, the migrants endeavored to carve out a harsh life one-hundred and forty miles from Rak and called their new settlement Sandholm.
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Carrow has one main landmass that comprises the majority of its surface. This continent boasts two primary centers of residence: Suraka and Rak, the centers of human and Sangheili governence on the planet, respectively. Between them stretches kilometers of desert. Rak is situated along a hidden river in the midst of this desert. One-hundred and forty kilometers from Rak lies Sandholm, a human settlement. Between them, at seventy kilometers from each, an oasis called Masov Oasis is controlled by Sangheili.