İmralı prison is a high-security prison on the island of İmralı in the Sea of Marmara in Turkey. It holds prisoners from the Kurdistan Workers' Party (PKK) and one prisoner of the Communist Party of Turkey/Marxist–Leninist (TKP/ML). The prison facility is guarded by the military and is also monitored over satellite imagery from space. The prison is a witness to several memorable moments in Turkish history.