After hiking most of the shoreline from Hanamaulu Bay to Anahola Bay it dawned on me that an interesting geologic feature that nearly escapes notice was a constant companion most the way. Though discontinuous in places, and often only visible at low tide, a naturally formed limestone shelf, a barrier between reef and shore, surrounds the island of Kaua‘i.
For commercial reasons, the shelf was obliterated at Hanamaulu Bay, to provide a sheltered harbor and pier at Ahukini Landing. By contrast, the limestone formation appears to extend forever northward from the south end of Nukoli‘i Beach. In reality, it vanishes briefly adjacent to the Wailua Municipal Golf Course, and is only visible intermittently near the mouth of Wailua River.
“Baby” Beach exists because of the tidal trough between an extent of the limestone formation and the seawall along Moanakai Road In Kapa‘a Town. Google Maps calls this Fuji Beach, but everyone in town knows it’s Baby Beach.
An appreciable portion of the limestone formation rings the second embayment north of Donkey beach. This beach is popular with monk seals because it’s nicely sheltered and the fishing is good, but if you see them on the beach, just move it along because they absolutely need their rest, AND it is against the law to approach or disturb them. You can see an isolated chunk of limestone submerged in the first photo, and the remainder of the formation at water’s edge in the background.
As the old right of way veers inland beyond Donkey Beach, each of the little bays onward to Anahola Beach State Park are only accessible via dedicated dirt roads and recent motocross trails, or at low tide by rock-hopping along the shore. The next photos show isolated hunks of the bar overlain with younger volcanic debris or thrust up along the shore nearer to Anahola.
Just south of Anahola Bay lies another little ring, tilted up somewhat like the formation at Baby Beach. Coincidentally, that similarity is what awakened me to the fact that I had “seen this somewhere before.”
While this formation certainly is not all there is to see between Nukoli‘i Beach and Anahola Beach, it’s been more of a companion. Running, hiking, and rock-hopping Kauai‘i’s eastern shore is never boring.