Say'un - (ma transliterated kamar yadda Saywun, Sayoun ko Seiyun . Larabci: سَيْئُوْن‎  ن prounci Had Hadhrami : [seːˈwuːn], Larabci Adabi: [sæjˈʔuːn] ; Tsohon Kudu Arabian : 𐩪𐩺𐩱𐩬 S¹y'n) - Ta kasan ce kuma shi ne birni a yankin da kuma Governorate na Hadhramaut a Yemen . Tana cikin tsakiyar Kwarin Hadhramaut, kimanin 360 kilometres (220 mi) daga Mukalla, babban birnin gundumar Mukalla kuma birni mafi girma a yankin, ta hanyar yamma. Hakanan 12 kilometres (7.5 mi) nesa da Shibam da 35 kilometres (22 mi) nesa da Tarim, sauran manyan biranen kwarin. Ance asalin garin kuma ya kasance wurin hutu ga matafiya. Akwai wani gidan gahawa tare da wata mace mai suna Seiyun a wurin, kuma an sanya wa yankin sunan ta ne don girmama ta. Tun daga wannan lokacin, garin ya zama mafi girman yankin kwarin Hadhramaut. Manyan ƙauyukan da suka kewaye garin ciki har da Madurah, Mérida, Burr, Hazkir, da Houta Sultana. Sannan ana amfani da shi ta Filin jirgin saman Seiyun .