Location from Re:Zero by Tappei Nagatsuki
The Sage's tower at the edge of the known world — where Subaru went to save Rem, lost his memories instead, and discovered that the tower's guardian had been waiting alone for four hundred years.
The Pleiades Watchtower rises from the Augria Sand Dunes like a needle stabbed into the desert. It is one of the great mysteries of the world — a tower built by the Sage Flugel, guarded by the scorpion-woman Shaula, and containing within its floors a library of knowledge that includes the forbidden Book of the Dead. The tower tests anyone who enters, and its trials are not survivable by normal means. Subaru came here to find a cure for Rem's memory-eaten coma. Instead, Arc 6 stripped him of his own memories, confronted him with the gap between who he was and who he'd become, and forced a version of Subaru who didn't remember Return by Death to survive in a tower full of people who depended on a version of him that no longer existed. Shaula — the tower's guardian — recognized Subaru as her master, which raises questions about Flugel that nobody is ready to answer. The tower holds answers. It charges admission in sanity.
Also known as: Pleiades Watchtower, the Watchtower, Sage's Tower, Taygeta