A facility where dead bodies are kept, especially for identification or before burial/cremation. More formal and specific than 霊安室 (reianshitsu), which is often used in hospitals.
The unidentified body was taken to the morgue.
霊安室 is a hospital mortuary, while 死体保管所 is a more general term for a morgue, often used in police or public contexts.
Compound of 死体 (shitai, 'dead body') + 保管 (hokan, 'storage, custody') + 所 (sho, 'place').