also: みりょん
noun
secret military camp; guerrilla camp
Refers specifically to hidden bases used by Korean independence fighters or guerrillas, especially during the Japanese colonial period. The term is a borrowing from Korean 밀영 (miryeong).
from Korean miryeong
独立軍は密営を拠点に日本軍と戦った。
The independence army fought the Japanese forces from their secret camp.
この地域には当時の密営跡が残っている。
Remains of secret camps from that era still exist in this area.
ゲリラ基地 is a more general term for a guerrilla base, while 密営 specifically refers to Korean secret camps with historical connotations.
Borrowed from Korean 밀영 (miryeong), meaning 'secret camp'. The kanji 密 (secret) and 営 (camp) directly correspond to the Korean meaning.