noun
southern sea; South Sea
Refers to a sea or ocean area in the south, often used in proper names like 南海トラフ (Nankai Trough) or historical contexts.
南海トラフ地震に備える。
Prepare for a Nankai Trough earthquake.
昔、南海は未知の世界だった。
Long ago, the southern seas were an unknown world.
Compound of 南 (south) and 海 (sea). The reading なんかい is the standard on'yomi combination.