Sources differ on whether or not khanat is a unit of land area.
For gardens or plantations the word khănẵt is used instead of the word rằi. The khănẵt is a piece of ground forming a single garden or plantation of any extent. Talking of the extent of a garden or plantation it is said that it has so many sen and so many va [wah] in length and in breadth. (Thus introduction, page 46, but on page 316:)
khănẵt ... Measure of gardens (twenty square fathoms [i.e., square wah])
D. J. B. Pallegoix.
J. L. Vey, revisor.
Siamese French English Dictionary.
Bangkok: Printing-Office of the Catholic Mission, 1896.
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Last revised: 15 September 2012.