Japan.

100 V · 50/60 Hz on Type A, Type B.

The world's lowest mains voltage at 100 V, and a grid split in two: eastern Japan including Tokyo runs at 50 Hz while the west including Osaka runs at 60 Hz. Sockets take the two-blade Type A almost everywhere, with earthed Type B in newer buildings. US plugs fit, but 230 V appliances from Europe will underperform here.

The voltage window

A nominal 100 V supply may legitimately sit anywhere between 90 and 110 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Japan. Prose is our own.

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Coming here from somewhere else?

Plug straight in — Japan runs 100 V 50/60 Hz on Type A, Type B. Mains frequency differs; anything with a synchronous motor or clock will care.

Faces drawn to scale from pin dimensions · verdicts are physical fit + voltage math, not safety advice — when in doubt, ask the hardware store, not the internet.