Annie's Canyon Trail, situated within the San Elijo Lagoon Ecological Reserve in Solana Beach, which is part of San Diego County, California. It's recognized as one of San Diego's natural wonders and is known for its unique, narrow sandstone slot canyon. The trail is a popular hiking destination, offering a short but engaging 1.6 to 1.8-mile loop with an elevation gain of about 200 feet. The official opening of Annie's Canyon Trail was in 2016 after volunteer groups helped remove graffiti and construct the trail.