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Three sides of Isengard were guarded by a large wall, known as the Ring of Isengard, which was only breached by the inflow of the river Angren at the north-east through a portcullis, and the gate of Isengard at the south, at both shores of the river. Inside the walls is found the Orthanc, one of the two towers.
- Othram, around Minas Tirith