Minamidaitō Island, Raised coral atoll in Okinawa Prefecture, Japan
Minamidaitō is a raised coral atoll in Okinawa Prefecture, Japan, forming an oval shape with steep limestone cliffs that rise roughly 75 meters above the sea. The interior holds more than 100 cave systems carved through the porous limestone rock, containing underground lakes and passages.
The Russian frigate Borodino sighted the atoll in 1820, giving it the former name South Borodino Island. Japanese settlers arrived in 1900 from the main Okinawa island, bringing sugarcane cultivation and establishing a permanent community.
The sugarcane grown here turns into Cor Cor rum, a local spirit that visitors can find in shops and try as a souvenir of the island. Farmers work the fields between limestone outcrops, and their rhythm shapes the daily life across this remote coral platform.
Flights from Naha Airport take about 70 minutes and run daily, while a monthly ferry runs for roughly 15 hours. To explore the underground lake systems, sign up for guided cave tours in advance since access requires an escort.
The cave system called Akiba Chiteiko contains an underground lake reachable only through narrow rock passages that keep a steady temperature year-round. The lake sits deep below the surface, where no daylight enters and the silence is broken only by dripping water.
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