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Iriomote Ishigaki NP, Okinawa
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Kaiji’s “star sand” isn’t mineral sand: each grain is the calcium-carbonate shell of Baculogypsina sphaerulata, a one-celled foraminifer that lives on sea vegetation before washing ashore.
Some grains at Kaiji are actually called “sun sand”: the shells of another foraminifer, Calcarina. Look for a rounder center and blunter tips than the sharper-looking Baculogypsina stars.
Each empty star-sand shell once sheltered a tiny partnership: its single-celled foraminifer hosted photosynthetic diatoms, which made food from sunlight inside the shell—a miniature ecosystem in one grain.
Star-sand points are fragile. As the shells travel from offshore reefs to Kaiji, wave action can chip their spines, so some grains arrive rounded rather than sharply star-shaped.
The ground around Kaiji preserves a long timeline: its shell midden, dated to about 1000 CE, is Taketomi’s oldest known site; later layers include a 16th-century government office and an 18th-century migrant settlement.
Kaiji was a working harbor and political hub: Taketomi-born Nishito returned in 1524 as Yaeyama’s first chief administrator, governing from a nearby office after helping build Shuri’s 1519 Sonohyan-utaki stone gate.
Nishito also brought technology from Shuri to Kaiji: the nearby government site had Taketomi’s first iron foundry, which enabled the making of new agricultural tools on the island.
On nearby Aiyaru Beach—not Kaiji itself—an old Taketomi tale says a sea serpent ate the star-children; their “bones” washed ashore, and incense smoke sent them back to heaven. Star sand is also said to bring happiness.
A local nature foundation’s guided cleanup survey from Kaiji toward Taketomi’s south tip doubled as a history walk: guides explained a former power-line trench and a wartime pillbox hidden in the landscape.
The subtropical coast at Kaiji is a botanical rarity: park interpretation lists 14 coastal plants—including screw pine, shell ginger and spider lily—and notes that few natural shoreline forests like this remain in Okinawa.
