Knob Hill is named after a 5 foot rock formation that resembes a doorknob. The doorknob is in 20 feet of water. 100 feet to the east resides a large field of leather coral which is uncommon off Lanai. The dive site contains several archways and swim throughs for divers. You can see Heller's Barracuda at this site as well as a large school of Pyramid Butterflyfish.