thumb|The "Great Hafir" at Musawwarat es-Sufra A hafir, or haffir, is an artificially constructed water catchment basin with a circular earthen wall and diameters of between 70-250 m and heights of up to 7 m. Adapted to semi-desert conditions, the hafirs catch the water during the rainy season to have it available for several months during the dry season to supply drinking water, irrigate fields and water cattle. It is used in central Sudan from time immemorial.
thumb|The "Great Hafir" at Musawwarat es-Sufra A hafir, or haffir, is an artificially constructed water catchment basin with a circular earthen wall and diameters of between 70-250 m and heights of up to 7 m. Adapted to semi-desert conditions, the hafirs catch the water during the rainy season to have it available for several months during the dry season to supply drinking water, irrigate fields and water cattle. It is used in central Sudan from time immemorial.
==History==
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).