Tarang wa

A tarang wa (Thai: ตารางวา, RTGS: tarang wa, IPA: [tāːrāːŋ wāː]) or square wa, sometimes transliterated as 'waa' or 'wah' is a unit of area used in Thailand for measuring land or property. It is defined as the area of a square whose sides measure exactly one wa (two metres), equivalent to four square metres.[1] Although its current size is precisely derived from the metre, it is neither part of nor recognized by the modern metric system, the International System (SI).

The square wa equals 1/100 ngaan or 1/400 rai, two units of area frequently used in Thailand. It also equals 1/25 are, another metre-derived unit of area not officially part of the SI.

As with many terms normally written with the Thai alphabet, there are many variant transliterations into English, e.g. dta-raang waa and tarang wah.