also: りっかい
noun
land and sea
Refers to both land and sea as a pair, often used in contexts like transportation, geography, or military operations.
陸海の交通網が整備されている。
The land and sea transportation network is well developed.
noun
army and navy
Used to refer to both the army and navy together, often in historical or military contexts. Cross-references 陸軍 and 海軍.
陸海の両軍が演習を行った。
Both the army and navy conducted exercises.