Shōwa Flat is a small flattish area along the northwest shore of Lake O-ike in the east part of Ongul Island. It was mapped from surveys and air photos by the Japanese Antarctic Research Expedition of 1957-1962 (JARE), and named Shōwa-taira (Emperor Hirohito's era flat), presumably in association with Showa Station, the scientific station established by JARE on nearby East Ongul Island.
References
Shōwa Flat Wikipedia(Text) CC BY-SA