Knob Hill

Knob Hill, Lanai

Knob Hill is an interesting and very nice dive site.  It is fairly shallow about 55 to 60 feet (16 to 18 meters) and teeming with life.  However, it is often not possible to dive on this site due to strong currents .  The dive site is just off the coast of Lanai by the Four Seasons Hotel.  The name comes from a large rock formation near the surface that is supported by four columns.  This is a large dive site on the south side of Lanai that is quite exposed.  I have been diving around Lanai for over 12 years and have been on this site maybe three or four times.

Knob Hill Rating = 3.86 out of 5

  • Visibility – moderate to very good
  • Access – Moderate; boat only and 45 to 50 minutes from Lahaina Harbor
  • Current – moderate strong most of time
  • Depth to 60 ft / 18 m
  • Reef health Hard / Soft Corals – Very Good
  • Marine species variety – Very Good
  • Pelagics / Mammals / Turtles / Rays – moderate to good, typical at least 1 to 3 sightings up close, sometimes many more

The only reason this site is not rated higher, is the current makes it a very difficult dive site to dive 80% of the time.  If the current is mild this is an awesome site.

Knob Hill Overview

Knob Hill Reef, Steven W Smeltzer, Lanai

Knob Hill Reef

Knob Hill has a number of swim throughs and volcanic structures, such as the “table” above that make the site quite interesting.  The marine life on the site is varied and abundant.  You will almost always find large schools of Pennant Butterflyfishes along with a wide variety of other  Butterflyfishes, Dascyllus, Yellow Tangs, Sea Turtles, White-tip Reef Sharks, various eels and much more.  Once the boat is on the mooring at Knob Hill, the dive master make take you on several different routes around this expansive dive site.  The hard coral here is quite healthy due to the current and infrequent visits by divers.  There is a nice swim through / cave where you can frequently find White-tip Reef Sharks.  You can also see quite a few nudibranchs on this site and rare species such as the endemic Yellow-striped Coris and Reticulated Butterflyfish.

Knob Hill, White-tip Reef Shark, Steven W Smeltzer,

White-tip Reef Shark, Profile, Triaenodon obesus, (Rüppell, 1837), mano lalakea, Lanai, Hawaii

There is also a nice swim through / cave on the site where you can many times find White-tip Reef Sharks.  This shark in particular was quite curious and swam with me through the swim through.  He even gave me a nice profile. 🙂

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The pool is open…..