Fersah
Fersah was an Ottoman unit of distance.
It was based on the distance covered by a horse in normal gait per hour. Its modern definition (parasang) is 5.685 km (3.532 mi). [1] There were other definitions. According to Islam Encyclopaedia, ıt was sometimes 6.985 km (4.340 mi) or 6.230 km (3.871 mi).[2]
References
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