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Isengard
There was only one entrance to the ring wall of stone round Orthanc. This was in the south. (The Road to Isengard; Bk 2).
Orthanc was made of four joined pillars of rock (there is a Tolkien drawing of it) and was 500 ft high.
Merry and Pippin came in from the north down the long ravine on the slopes of Mount Methedras.
