Gashua, al'umma ce a cikin jihar Yobe da ke arewa maso gabashin Najeriya, a kan kogin Yobe 'yan mil kaɗan a ƙarƙashin daidaituwar Kogin Hadeja da Kogin Jama'are . A matsakaicin hange ya kusan kaiwa mita 299. Yawan jama'ar su a shekarar kidaya ta 2006 ya kusan 125,000. Watannin da suka fi kowanne zafi sune watan Maris da Afrilu, wanda zafin su har ya kai 38-40 o Celsius. Lokacin damina kuma sune, Yuni-Satumba, yanayin zafi yana faduwa har zuwa 23-28 o Celsius, tare da ruwan sama na 500 zuwa 1000 mm. Gashua na daya daga cikin manyan biranen ci gaba a jihar Yobe. Tun shekarar 1976 shi ya kasance hedkwatar Bade karamar . Ana magana da harshen Bade a cikin Gashua kuma a yankin da ke fitar da gabas da kudu da Gashua. Bade yana daya daga cikin yaruka bakwai na yan asalin yankin tafkin Chadi zuwa jihar Yobe. Garin yana kusa da Wuruka na Nguru-Gashua, tsarin tattalin arziƙi da kuma tsabtace muhalli. Garin shine wurin kotun Mai Bade, Sarkin Bade . Garin Kumariya kuma yana cikin yankin Gashua.