A myriad is an area 100 km x 100 km square i.e. it is 10,000 (ten myriad) square km.. 100 of these squares would be one million square km..
The term has a particular use in connection with the British Ordnance Survey national grid, where the grid is divided into 100km x 100km squares, each with a two letter prefix. For example, prefix TL refers to the myriad 500km east and 200km north of the grid origin.
A myriad contains 100 hectads
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