Bigha

The bigha (also formerly beegah; Hindi: बीघा, Assamese: বিঘা, Bengali: বিঘা) is a traditional unit of measurement of area of a land, commonly used in Nepal, Bangladesh and in a number of states of India, including Uttarakhand, Maharashtra, Haryana, Himachal Pradesh, Punjab, Madhya Pradesh, Uttar Pradesh, Bihar, West Bengal, Assam, Gujarat and Rajasthan but not in southern states of India. There is no "standard" size of bigha. The size of a bigha varies considerably from place to place. Sources have given measurements ranging from 1,500 to 6,771 square metres (16,150 to 72,880 sq ft), but in several smaller pockets, it can be as high as 12,400 square metres (133,000 sq ft). Its sub-unit is Biswa (or Bisa) or Katha (or Katta) in many regions. Again there is no "standard" size of biswa or katha. A bigha may have 5 to 200 biswa in different regions.

In India, bigha ceased to be an official unit of area in 1957 when square metre or hectare (10,000 square metre) became the official legal unit of area of land.

The bigha is a traditional unit of land in several parts of South Asia. Sale and purchase of land (particularly agricultural land) is still done unofficially in this unit. However, the area is recorded in hectare or square metres in official land records. Bigha varies in size from one part of India to another. Various states and often regions within the same state have different sizes attributed to the bigha. It is usually less than one standard acre (4,840 square yard or 4,047 square metre) but can extend up to 3 acres (1.2 hectare).

...
Wikipedia