The Hamhung diocesan territory stretches over 52,322 square kilometers and covers Hamkyongnam and Hamkyongbuk provinces. However, its southern part belongs to Tokwon Territorial Abbacy in North Korea.

The facility, known as the February 11 plant, is part of the Ryongsong Machine Complex in Hamhung, North Korea's second-largest ... conceal the facility's future activities from satellite observation.