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Two hundred miles above this the Rio Virgen joins the Colorado. This river heads in the Markagunt Plateau and the Pine Valley Mountains of Utah. Its sources are 7,000 or 8,000 feet above the sea, but from the beautiful course of the upper region it soon drops into a great sandy valley below and becomes a river of flowing sand.
On the north there is a pair of plateaus, twins in age, but very distinct in development, the Paunsagunt and Markagunt. They are separated by the Sevier River, which flows northward. Their southern margins constitute the highest steps of the great system of terraces of erosion. This escarpment is known as the Pink Cliffs. Above, pine forests are found; below the cliffs are hills and sand-dunes.
The Virgen River heads back in the Pink Cliffs of the Markagunt Plateau and with its tributaries crosses one of these plateaus above the Gray Cliffs, carving a labyrinth of deep gorges. This is known as the Colob Plateau. Above, there is a vast landscape of naked, white and gray sandstone, billowing in fantastic bosses.
They are east of the Great Basin, and with the other plateaus form an area called by Powell "The Plateau Province." Eastward still the plateaus merge into the "parks." The High Plateaus, as a topographical feature, are a southern continuation of the Wasatch Mountains. They terminate on the south in the Markagunt, the Paunsagunt, and the Aquarius Plateaus.
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