hectares

noun
  1. 1

    A unit of surface area (symbol ha) equal to 100 ares (that is, 10,000 square metres, one hundredth of a square kilometre, or approximately 2.5 acres), used for measuring the areas of geographical features such as land and bodies of water.

Source: https://en.wiktionary.org/wiki/hectare, https://en.wiktionary.org/wiki/hectares