The park encompasses the dramatic Aliso Canyon, which is the valley formed by Aliso Creek as it slices through the San Joaquin Hills on its way from the Cleveland National Forest to the Pacific Ocean. Wood Canyon is formed by Wood Canyon Creek as it flows south to join Aliso Creek in the center of the park. Another tributary, Sulphur Creek, joins Aliso Creek at the eastern end of the park. Elevations within the park range from above sea level to at Temple Hill in Laguna Beach (colloquially Top of the World), on the park's western boundary. On a clear day, most of Orange County can be seen from Temple Hill and the other ridge tops surrounding Aliso Canyon.