Ahsan al-Taqasim fi Ma'rifat al-Aqalim, The Best Divisions for Knowledge of the Regions, was eventually published in 985CE/375AH, and a revised edition was produced three years later.
Written 1000 years ago, this geographical treatise was based on some 20 years of experiences undergone and observations noted in the author's survey of the realm of Islam, from the Atlantic to the Indian Ocean. He presents his observations on its topography, vegetation, religion and culture."
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