The vast expanse of the Misty Mountains divides the western and eastern halves of Middle-earth, making travel and commerce between those lands difficult. The few roads across the Mountains are fraught with danger. The first is to travel all the way around the southern end of the Misty Mountains, through the Gap of Rohan, but it is rumoured that Orcs now range freely there. The second path is through the Redhorn Gate, about halfway between Rivendell and the Gap of Rohan, but the stirring of the Shadow in the East has caused even that pass to become an abode of evil.
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