From Beaver Rim, the Wind River Mountains, part of the Rocky Mountain chain, rise in fifty-three granite peaks more than 13,000 feet high, with the Continental Divide running the length of the range so that water on its east side flows to the Atlantic Ocean and water on its west side reaches the Pacific Ocean. During the geologic event known as the Laramide Orogeny, the Wind River Mountains were pushed upward 60,000 feet, and after 10 million years of erosion, the Precambrian granite peaks, identified here as the oldest rocks in the world, remained jutting into the sky. Beaver Rim itself was formed by marine deposits from shallow ancient inland seas, and its white cliffs reflect the last 65 million years of Wyoming's geologic history. Native Americans traveled this path for more than 10,000 years, mountain men explored the Wind Rivers for beaver pelts beginning in the early 1800s, and gold miners and pioneers sought fortune here beginning in the mid-1800s. The Oregon-Mormon-Gold Rush Trail passes within 10 miles east of Beaver Rim. Fremont County is home to the Eastern Shoshone and Northern Arapaho tribes and includes almost 200 miles of the Continental Divide, Gannett Peak, Wyoming's highest mountain, at 13,804 feet, more than 70 miles of the Oregon Trail, 626 lakes and reservoirs, over 2000 miles of rivers and streams, and abundant wildlife.