A marabba is an obsolete unit of area in India and Pakistan approximately equal to 25 acres, (10.117 hectares). After metrification by both countries in the 20th century, the unit became obsolete.
It is not obsolete. The unit is used by people today.(25 Acres - they would know it by visual size of an average crop field.- that will sustain 3 generations of an average family)
Web site: Marabba . 2007-02-19 . Sizes.