Reprinted from OC Trails
Once a month, OC Parks and the Irvine Ranch Land Conservancy open Limestone Canyon Wilderness Park up for a Wilderness Access Day. Most of the time, Limestone Canyon is only open for limited guided tours, which anyone can sign up for through the Irvine Ranch Natural Landmarks Activities page. However, during the Wilderness Access Day, you’ll have free reign around any of the trails in Limestone Canyon.
The main draw of Limestone Canyon is a geological feature called The Sinks. The Sinks is a large canyon carved into the soft limestone hills that has been called The Grand Canyon of Orange County. Unfortunately, people are not allowed to climb down into The Sinks, but are only allowed to look at it from above due to their delicate nature. Continue reading