A rai is a unit of area, equal to 1,600 square metres (40 m × 40 m), used for measuring land area. Its current size is precisely derived from the metre, but is neither part of nor recognized by the modern metric system, the International System (SI). The rai equals 4 ngaan or 400 tarangwa aka square waa.
Rai stones are large, circular stone disks carved out of limestone in the island of Yap, Micronesia. Locals have used these stones as a form of unusual currency, a "stone money."
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