A frontier planet claimed by both Andorians and Vulcans, known to the Vulcans as Paan Mokar.
Weytahn is a planet on the frontier between Andorian and Vulcan space. The Andorians call it Weytahn and the Vulcans call it Paan Mokar, and both claim it. In Cease Fire, Shran breaks a treaty by reoccupying a settlement there, and the fighting leaves Vulcans held hostage.
Shran asks Archer to mediate, and Archer and T'Pol go down to the planet despite Ambassador Soval's doubts. After their shuttle is shot down and tensions nearly boil over, a cease-fire is reached, an early step toward cooperation between the two powers.