Big Sycamore Canyon, often shortened to Sycamore Canyon, is a major feature of Point Mugu State Park, in Ventura County, California, United States. Sycamore Canyon is situated in the northernmost region of the Santa Monica Mountains National Recreation Area below the peaks of the Boney Mountain State Wilderness Area. The canyon begins on the north slope of Boney Mountain and heads north down the slope. The canyon then heads southwest past Rancho Sierra Vista/Satwiwa to Sycamore Cove on the coastline.