Zamami Island - Remote Island Spectacle Where Kerama Blue Sea and Starry Sky Intertwine

Overview

Zamami Island is a Kerama Islands island approximately 40 kilometers west of Okinawa Main Island. Designated as Kerama Islands National Park in 2014, its "Kerama Blue"—famed for high transparency—is a world-renowned diving destination.

However, Zamami Island's appeal extends beyond the sea. Remote island characteristics mean minimal light pollution, with starry skies filling the night overhead. This location offers the luxury of daytime sea and nighttime starry sky experiences.

Observation Environment

Zamami Island is a small island with approximately 600 inhabitants, with settlements concentrated near the harbor. Beyond settlements, artificial light is minimal, allowing dark sky viewing from beaches and observatories. Bortle scale class 2 darkness is maintained.

Despite approximately 40 kilometers from Naha City, Okinawa Main Island light may faintly affect the western horizon. However, overhead sky maintains sufficient darkness with distinctly visible Milky Way. The subtropical warm climate allows relatively comfortable extended outdoor observation even in winter—a major advantage.

Recommended Observation Points

Kami-no-Hama Observatory is on the island's west side, opposite Naha direction, experiencing minimal light pollution with darkest skies. Kozamami Beach's open southern horizon suits southern constellation observation.

Takatsuki Mountain Observatory, the island's highest point, offers 360-degree views, though nighttime hiking requires foot caution.

Access

High-speed ferry "Queen Zamami" approximately 50 minutes from Naha Tomari Port, ferry "Zamami" approximately 120 minutes. High-speed service: 2-3 daily trips; ferry: 1 daily trip. Summer bookings become difficult—advance arrangements recommended.

Island accommodations center on minshuku (private inns) and pensions, many with attached diving shops.

Observation Tips

Zamami Island's subtropical climate means summer high humidity. Camera and lens condensation prevention is essential. Winter (December-February) brings decreased humidity with increased sky transparency.

Beach observation with wave sounds as stargazing soundtrack offers premium experience, but watch tide changes. Summer includes box jellyfish season—watch beach footing.