An area of 10,000 m² (roughly equivalent to a football pitch 120 x 80 m); one square kilometre consists of 100 hectares. The word hectare is composed of the Greek hekt(o) for "hundred" and ar and means 100 ares. Hectare is commonly used in European viticulture to indicate the size of vineyards.
In the production of quality wines, the maximum yield per wine-growing area or appellation or even smaller units/wine types is defined in hectolitres (hl) of wine or in kilograms (kg ) of grapes per hectare (yield per hectare). The acre used in England and the USA corresponds to 0.405 hectares (just under 2.5 acres/ha). One hectare consists of four acres (old area measurement).
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