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rai

In Thailand, ? – 21^st century, a unit of land area, by the Weights and Measures Act B.E. 2542 (1999) = 1,600 square meters (approximately 1,914 square yards or 0.40 acre).¹ It is one square sen. It is not used for paddy fields. Abbreviation, r.

Ordinarily, foreigners cannot own land in Thailand. However, a foreigner who invests 40 million baht in Thailand and receives “Board of Investment” approval may be allowed to own up to 1 rai of land in their own name.

In Lahu: lay, hay.

1. Technical Conversion Factors…, 1972, page 322.

sources

rai ... Agrarian measure of twenty fathoms square.

D. J. B. Pallegoix.
J. L. Vey, revisor.
Siamese French English Dictionary.
Bangkok: Printing-Office of the Catholic Mission, 1896.
Page 799.

“Fathom” translates wah.