(eds.), "ʿAththar - عثر " in The Beth Qaṭraye Gazetteer last modified January 10, 2020, https://bqgazetteer.bethmardutho.org/place/5552
  
    
      
        
          ʿAththar
          عثر
          ʿAthr
          
          The capital of the district and a seaport of importance. It was situated on the pilgrim road from Ṣanʿāʾ, between al-Had̲j̲ar (= Ḏj̲āzān) and Bayḍ, and is quoted already in the year 11/632 as belonging to the insurgent al-Aswad [q.v.].
          
            فقالت الفقهاء المصر كل بلد جامع يقام فيه الحدود ويحله امير ويقوم بنفسه ويجمع رستاقه مثل عثر ونابلس وزوزن
          
                    
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          https://bqgazetteer.bethmardutho.org/place/5552
          http://syriaca.org/place/5552
          https://tools.wmflabs.org/geohack/geohack.php?language=ar&pagename=مدينة_عثر&params=17_08_09.3_N_42_26_43.6_E_type:
          
            Aḥsan al-taqāsīm fī maʿrifat al-aqālīm
                        Muḥammad ibn Aḥmad Maqdisī
                        
            9
          
                    
                        Encyclopaedia of Islam, Second Edition
                        P. Bearman
                        
                    
                    
                        https://tools.wmflabs.org/geohack/geohack.php?language=ar&pagename=مدينة_عثر&params=17_08_09.3_N_42_26_43.6_E_type:GeoHack