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OʻAHU · LEEWARD COAST

Ko Olina Guide — 4 Lagoons & Resorts Mapped

Which lagoon is Aulani on? Can you use any lagoon? Man-made lagoons explained.

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⚠️ The 72-Hour Rain Rule

The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. Ko Olina is on Oʻahuʻs dry leeward coast, receiving about 20 inches of rain per year. The man-made lagoons self-clean through ocean water exchange, but heavy rain can still introduce runoff from the surrounding development.

4 Lagoons, 4 Different Experiences

Ko Olina is a master-planned resort community on Oʻahuʻs dry leeward coast, about 35 minutes west of Waikiki. Its signature feature is four man-made lagoons carved from the rocky shoreline, each offering calm, protected swimming. All lagoons are public by Hawaiʻi law.

Lagoon 1: Kohola Lagoon (Southernmost)

Resorts: Aulani Disney Resort & Spa + Four Seasons Resort Oʻahu (shared lagoon)
Character: Most popular lagoon. Can be very crowded, especially on weekends. Disney characters appear on the Aulani beach area.
Parking: Limited public parking. Fills by 9-10am on weekends. Resort valet available for guests.

Lagoon 2: Honu Lagoon

Resorts: Beach Villas at Ko Olina (timeshare/vacation rentals)
Character: Quieter than Lagoon 1. Good snorkeling around the lagoon edges. Sea turtles sometimes enter.
Parking: Easier to find public parking than Lagoon 1.

Lagoon 3: Naiʻa Lagoon

Resorts: Marriottʻs Ko Olina Beach Club
Character: Moderate crowds. Good facilities. The walking path between lagoons passes through here.
Parking: Public lot available, moderate competition.

Lagoon 4: Ulua Lagoon (Northernmost)

Resorts: None directly on the lagoon (future development planned)
Character: Most public-friendly. Easiest access and most parking. Less resort infrastructure but also fewer crowds.
Parking: Largest public parking lot. Best option for day visitors not staying at a resort.

How the Lagoons Self-Clean

Each lagoon has a narrow opening to the ocean. Twice daily, tidal exchange pushes ocean water in and pulls lagoon water out. This natural flushing keeps bacteria levels low under normal conditions. The lagoons are also shaped to maximize circulation — water doesnʻt stagnate in corners. However, after heavy rain, runoff from the surrounding development can temporarily elevate bacteria levels before the next tidal cycle flushes it out.

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⚠️ Important Disclaimer

Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions.

Always verify current water quality conditions with the Hawaii DOH Clean Water Branch before entering the water.

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