Josephus wrote that "Moses went up to a mountain that lay between Egypt and Arabia, which was called Sinai." Josephus says that Sinai is "the highest of all the mountains thereabout," and is "the highest of all the mountains that are in that country, and is not only very difficult to be ascended by men, on account of its vast altitude but because of the sharpness of its precipices". The traditional Mount Sinai, located in the Sinai Peninsula, is actually the name of a collection of peaks, sometimes referred to as the Holy Mountain peaks, which consist of Jabal Musa, Mount Catherine and Ras Sufsafeh. Etheria (circa 4th century CE) wrote, "The whole mountain group looks as if it were a single peak, but, as you enter the group, see that there are more than one." The highest mountain peak is Mount Catherine, rising above the sea and its sister peak, Jabal Musa (), is not much further behind in height, but is more conspicuous because of the open plain called "er Rachah" ("the wide"). Mount Catherine and Jabal Musa are both much higher than any mountains in the Sinaitic desert, or in all of Midian. The highest tops in the Tih desert to the north are not much over . Those in Midian, East of Elath, rise only to . Even Jabal Serbal, west of Sinai, is at its highest only above the sea.