The square wah, a common unit of area in Thailand, equal to exactly 4 square meters or 43.0556 square feet. There are 100 talangwah in 1 ngarn, 400 in 1 rai
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}