Thomas A. Carlson, David A. Michelson and Tobias Scheunchen, (eds.), "Caspian Sea — ܝܡܐ ܕܩܙܒܝܢ " in The Beth Qaṭraye Gazetteer last modified January 10, 2020, https://bqgazetteer.bethmardutho.org/place/61
    
        
            
                
                    Caspian Sea
                    ܝܡܐ
                        ܕܩܙܒܝܢ
                    ܝܰܡܐ
                        ܕܩܳܙܒܝܢ
                    بحر
                        قزبين
                    بحر
                        الخَزَر
                    بحر طبرستان وجرجان
                    Baḥr Ṭabaristān
                    بحر طبرستان
                    Caspium
                    Hyrcanium Mare
                    بحر
                        طبرستان
                    A large inland sea
                        north of Iran and east of Adharbayjān.
                    
                        ثم تلوتها بصورة أذربيجان وشكلت ما فيها من الجبال
                            والطرق والانهار العذبة كاكرس والكر الى ان رسمت بحيرة خلاط وبحيرة كبوذان
                            وكلاهما لا يتصل ببحر طبرستان وجبل القبق مطل عليه
                    
                    
                        42.47680139838509 49.85071903012941
                    
                    
                        38.5 50.5
                    
                    
                        Attestation of name بحر
                                الخَزَر in the Muʿjam
                                al-buldān of Yāqūt al-Ḥamawī.
                        
                    
                    
                        Attestation of name بحر طبرستان
                                وجرجان in the Kitāb
                                al-aʿlāq al-nafīsa of Aḥmad ibn ʿUmar Ibn
                                Rustah.
                        
                    
                    
                    https://bqgazetteer.bethmardutho.org/place/61
                    http://syriaca.org/place/61
                    http://pleiades.stoa.org/places/884130
                    http://en.wikipedia.org/wiki/Caspian_Sea
                    http://dbpedia.org/resource/Caspian_Sea
                    
                        The Gorgias Encyclopedic Dictionary of the
                            Syriac Heritage
                        
                        Map I D1, II D1
                    
                    
                        ܒܪ̈ܘܠܐ ܒܕܝܪ̈ܐ ܕܥܠ ܡܪܕܘܬ ܝܘܠܦܢ̈ܐ ܣܘܪ̈ܝܝܐ ܗܕܝܪ̈ܐ
                        
                        535
                    
                    
                        كتاب اللؤلؤ المنثور في تاريخ العلوم والأداب
                            السريانية
                        
                        504
                    
                    
                        The Scattered Pearls: A History of Syriac
                            Literature and Sciences
                        
                        552
                    
                    
                        http://pleiades.stoa.org/places/884130Pleiades: A Gazetteer of Past Places Roger Bagnall Richard Talbert Tom Elliott Lindsay Holman et al.
                        
                    
                    
                        Muʿjam al-buldān
                        Yāqūt al-Ḥamawī
                        
                        I407
                    
                    
                        Kitāb al-aʿlāq al-nafīsa
                        Aḥmad ibn ʿUmar Ibn Rustah
                        
                        83
                    
                    
                        Kitāb al-masālik wa al-mamālik
                        Abū al-Qāsim Muḥammad Ibn Ḥawqal
                        
                        8
                    
                    
                        http://pleiades.stoa.org/places/884130Pleiades: A Gazetteer of Past Places Roger Bagnall Richard Talbert Tom Elliott Lindsay Holman et al.