Refers to the surface area of land, typically for countries, continents, or regions. Often used in geographic or statistical contexts.
Japan's land area is about 378,000 square kilometers.
面積 is a general term for 'area' (of any surface), while 陸地面積 specifically means 'land area' as opposed to water area.
Compound of 陸地 (rikuchi, 'land') + 面積 (menseki, 'area').