Sarsin: An island in the Tolma Archipelago. The third island Ademon came to. At its edge is a circular mountain range called the Galidis Ridge. At its center is a swamp plain called Sidra. The bottom of the marshes in the Sirda plain is rich in rubies and sapphires. In the past, people would come there to take these precious stones out of the swamps. But today the Somi people do not allow to get there. The island has a diverse population of swamp creatures. In his book, Ademon describes only two species, the swamps ogre (Yol) and the Somies.