Soma is a municipality and district of Manisa Province, Turkey. Its area is 820 km², and its population is 111,789. The town lies at an elevation …Soma is a municipality and district of Manisa Province, Turkey. Its area is 820 km², and its population is 111,789. The town lies at an elevation of 161 m. From 1867 until 1922, Soma was part of the Aidin Vilayet of the Ottoman Empire.