Iriomote-Ishigaki National Park

Iriomote-Ishigaki National Park spans the Yaeyama Islands in Okinawa Prefecture, Japan, roughly 270 km east of Taiwan. It became an International Dark Sky Park in 2018, the first in Japan and only the second in all of Asia.

Why Iriomote-Ishigaki National Park is a top stargazing spot

Most of the park's night sky reaches Silver and Gold tier quality, an unusually dark standard for a location this accessible. Confirmed Bortle Class 1 to 2 conditions across the islands push the naked-eye limiting magnitude to around 6.6 to 7.1, dark enough that the sheer density of visible stars can cast faint shadows. Its remote island setting, far from mainland Japan's light pollution, lets an exceptional 84 of the 88 recognised constellations be seen from Ishigaki Island, compared to only around 60 from central Japan.

What you can see

The park's subtropical latitude brings sights unavailable at more northern dark-sky destinations. The Southern Cross is visible from April through early June, while July brings a particularly dramatic view of the Milky Way arching overhead. New moon nights during astronomical twilight offer the best conditions for the deepest views.

Visiting Iriomote-Ishigaki National Park at night

Professional stargazing tours operate across the islands, including 20-cm telescope tours, sunset and night kayak trips timed for stargazing, and access to the 105-cm telescope at Ishigakijima Observatory, which also hosts public stargazing parties. Most visitor accommodation clusters around the Uehara Port area, Hoshizuna Beach in the north, and Ohara Port in the south. Check tour operators and the observatory's schedule ahead of your visit, and plan around the new Moon for the darkest possible skies.

Best time to go

Because the islands sit close to the Tropic of Cancer, the Milky Way core rises high overhead through much of the year, with July giving an especially dramatic view, and the Southern Cross adds a sight most Japanese dark-sky sites cannot offer, from April to early June. Whatever month you visit, build your trip around the new Moon, allow 20 to 30 minutes for your eyes to adapt once fully dark, and use a red light rather than a phone screen to preserve your night vision.

Getting there

Ishigaki Island has direct flights from Tokyo (about 3.5 hours), Osaka (about 2 hours), Naha and Okinawa (about 1 hour), and Hong Kong, operated by carriers including JAL, ANA and Solaseed Air, with multiple flights daily. From Ishigaki Airport, buses run roughly every 15 minutes between 7am and 9pm, taking about 40 minutes to the city centre and about 50 minutes to Kabira. To reach Iriomote, ferries run from Ishigaki: the crossing to Ohara Port takes 35 to 40 minutes with departures every one to two hours, while the crossing to Uehara Port takes 45 to 50 minutes with departures every two to three hours.

See your named star from here

Skies dark enough to reveal 84 constellations give you a real chance of tracking down a star you have named. Bring your certificate's coordinates and a stargazing app to Ishigaki or Iriomote for the search. Explore star-naming packages, browse the star catalogue, or check our observatories directory for more dark-sky sites.