The Old Testament prophet Elijah, according to 1 Kings 19, is the last person recorded in the Bible as visiting Mount Sinai. The account of his visit does not give geographical details that help determine the actual location, but suggests the location was known long after the Jewish people left the mountain. Unfortunately, there are no surviving extra-biblical documents that mark the location. Whether the Second Temple's sacred books (given by Roman General Titus to Josephus) contained information on the location of Mount Sinai is unknown, but Josephus did write about the mountain. However, Dr. Har-El was a geologist and he discusses in detail the geographic and environmental markers in Sinai, which do survive to the present day. He notes how they compare with the biblical account.