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The hectare (ha) is a metric unit of area equal to 10,000 square meters or 100 ares, widely used in agriculture, forestry, and land management worldwide. Farms, vineyards, and nature reserves are typically described in hectares across Europe, Asia, and Oceania. One hectare equals approximately 2.471 acres, providing a convenient bridge between metric and imperial land measurements.

The square kilometer (km²) equals one million square meters and is used to measure large land areas such as cities, national parks, and countries. Geographic data, urban planning reports, and ecological studies rely on square kilometers as their standard area unit. One square kilometer equals approximately 0.3861 square miles or about 247.1 acres.