Maarek III was a planet mentioned by Jonathan Archer in 2153 in a deceitful ploy .
He told Degra that a fellow inmate in a Xindi-Insectoid prison had used it as a staging area while smuggling dilithium. It was described as "beautiful, with beaches that [went] on for thousands of kilometers." (ENT: "Stratagem")
Given the nature of the mention it is unclear if there really is a Maarek III