Kealakekua Bay and the District Around the Cook Monument

Kealakekua Bay sits on the west coast of Hawai'i island, about thirty minutes south of Kailua-Kona, and the water inside it has been a Marine Life Conservation District since 1969. The district covers roughly three hundred fifteen acres and is split into two subzones by an invisible line running from Cook Point to the north end of Nāpō'opo'o Beach, and that split decides where a boat is allowed to drop an anchor at all.

How is the Kealakekua Bay conservation district actually divided?

The district runs from the high water mark seaward to a line drawn from Cook Point to Manini Beach Point, and a second line, from Cook Point to the northern end of Nāpō'opo'o Beach, divides that area into Subzone A and Subzone B. The two subzones carry different rules for boats, which is the detail most worth knowing before a trip is booked rather than after the boat is already on the water.

What are the actual anchoring rules inside the bay?

Anchoring is prohibited outright in Subzone A. In Subzone B, an anchor may only be dropped onto sand, or set in a way that avoids damaging coral. A boat that cannot find clear sand in Subzone B has one option left: pick up an existing mooring rather than anchor at all, the same practice described for small Kona dive boats working reef sites along the rest of this coast.

What can a diver or snorkeler not do inside the district?

Hawaii's Division of Aquatic Resources rules for the district prohibit fishing for, taking, or injuring any marine life, including eggs, taking or altering sand, coral, or any other geological feature, and feeding fish. The one exception is in Subzone B, where finfish may be taken by hook and line or thrownet, with other legal methods except traps allowed for akule, 'ōpelu and crustaceans. Subzone A is closed to all taking. For a diver or snorkeler the rules come down to one goal: leave the bay's bottom and its animals exactly as they were found, down to the sand.

How deep does the water get inside Kealakekua Bay?

Depth inside the district ranges from around five feet in the shallow margins to about one hundred twenty feet in Ka'awaloa Cove, the cove reached only by boat at the bay's northern end, where the division places the bay's best diving. That range, shallow reef shelf to deep cove, is why the bay supports both snorkeling close to shore and dive profiles that go considerably deeper without leaving the conservation district's boundary.

How does a diver or snorkeler actually reach Ka'awaloa Cove?

Nāpō'opo'o Beach, on the bay's eastern shoreline, has vehicle access by way of Highway 11, which makes it the entry point for anyone arriving by car. Ka'awaloa Cove, across the water at the district's northern boundary, is reachable only by boat, which is the reason most visits to the cove and the monument above it start from a dive or snorkel charter rather than a shoreline walk.

What is the monument standing at Ka'awaloa Cove?

A twenty seven foot monument to Captain James Cook stands near Ka'awaloa Cove, erected in 1878 close to the spot where Cook was killed in 1779. It marks the point where a Pacific voyage of exploration ended, on a shoreline that now borders a protected marine district built around the same water Cook's ships anchored in more than two centuries earlier.

What does the marine life inside the district actually look like?

The Division of Aquatic Resources describes the bay's waters as nearly pristine, its coral and fish diversity in Ka'awaloa Cove as exceptional, and its fish as quite tame, with dolphins commonly seen inside the bay. Abundant coral grows in about five feet of water below the northern cliff, while the Nāpō'opo'o side is generally shallow with little coral until a swimmer heads farther out. The rules above, no anchor damage in Subzone A, sand only anchoring in Subzone B, no fish feeding, and no taking of coral or geological material anywhere inside the boundary, have applied for more than five decades.

Why does Subzone A get a flat no-anchor rule instead of the sand-only rule used in Subzone B?

The Division of Aquatic Resources does not publish a reason, but the district's geography suggests one. Subzone A, the northern part, holds Ka'awaloa Cove and sits closer to the dense coral growth near Ka'awaloa Cove and the steeper drop toward the deeper water the Division of Aquatic Resources records at up to one hundred twenty feet, where clear sand patches large enough for a safe anchor set are harder to find than along the shallower shelf nearer Nāpō'opo'o Beach. A flat prohibition removes the judgment call a captain would otherwise have to make in low light or poor visibility, when a quick look over the side is not enough to confirm that a spot is really sand and not a thin dusting over living coral. Subzone B, with more exposed sand bottom, can carry a conditional rule instead of an absolute one, provided the anchor goes down only where sand is confirmed.

How does this rule set compare to the mooring habits used elsewhere on the Kona coast?

A six passenger boat working an open reef site outside the district still prefers an existing mooring to an anchor whenever one is in place, for the same reason the district's own rule exists: it keeps a chain or anchor flukes from being dragged across live coral during a set. Kealakekua Bay's rule simply makes that preference mandatory inside Subzone A and conditional inside Subzone B, rather than leaving it to each captain's judgment the way open water sites further down the coast generally do.