İmralı has use prison
İmralı is a small Turkish prison island in the south of the Sea of Marmara, west of the Armutlu-Bozburun peninsula within Bursa Province. It measures 8 kilometres (5 miles) in the north–south direction with a width of 3 kilometres (2 miles), and has an area of 9.98 square kilometres (3.85 sq mi). The highest peak is Türk Tepesi at an altitude of 217 metres (712 feet) above sea level. It is prohibited to fly over it or fish near its shores.