Sentinel Rock, Hill in California, United States

Sentinel Rock is a hill in Yosemite National Park, California, United States. It rises as a tall granite pillar with steep sides, standing above the surrounding valley floor and offering wide views of the area.

Sentinel Rock formed from granite that eroded over millions of years, leaving the hard pillar we see today. In the late 1800s, early park visitors used it as a landmark while traveling through the valley.

The name Sentinel Rock comes from its likeness to a guard watching over the valley. Today, visitors often pause at the base to take photos, and the rock appears in many paintings and drawings made by park visitors.

You can see the rock from many spots along the valley roads, and a short trail leads to a closer viewpoint. The path is uneven in places, so wear shoes with good grip and allow extra time if you want to stop often.

The rock's shape changes with the light, looking sharp in the morning and softer in the afternoon. A small spring near its base supports plants that stay green even in dry months.