It was built by the Gondorians after the War of the Last Alliance. The name means Spider’s Cleft. It was close to here that Shelob made her lair. Shelob was an ancient spider, that was there even before the Building of Barad Dur. After the Plague that hit Gondor, its garisson was decimated, making it easy prey for the Witch King and his orcs. It was here that Frodo and Sam fought Shelob, and also it was here that Sam rescued Frodo by the Orcs.