The noodles here are round in cross-section, thin, and without any crimp. That last detail is functional rather than aesthetic. Broth does not cling to a smooth round noodle the way it clings to a crimped flat one, so what you taste first is the noodle itself, and the soup arrives second.

The broth is pork bone with bonito, clear, and faintly sweet, lighter than its ingredients suggest. On top go slivers of three-layer pork belly simmered sweet and salty, Yaeyama kamaboko, and island scallion. No pickled red ginger, which is standard further north. On the table there is pipaachi, the island pepper, which people shake on generously.

Okinawa soba, the mainland island version, mostly uses thicker crimped noodles, often flattened. Set the two bowls side by side and they read as different dishes rather than variations. The round noodle spread here from around 1972 and became the identifying mark.

That is the part I keep returning to. The whole distinction rests on a noodle being thin and round instead of thick and flat. Nothing else changes very much. And yet a group of islands three hundred miles from the prefectural capital has its own name for its own bowl, defended in detail, over a difference of a few millimeters.