land, six
陸 centers on dry ground as opposed to water: land, shore, or solid earth. The 'six' meaning is a separate, unrelated numeric use that does not connect to the land idea.
陸 combines ⻖ (mound, hill) with 坴, which likely contributes the sound and the idea of a raised landmass. The character originally referred to high, dry land.
The left side ⻖ is a mound or hill, and the right side 坴 looks like a lump of earth with legs. Picture a solid hill of land rising from the water.
For リク, imagine a lick of land jutting into the sea: lick -> リク, and that tongue of earth is solid ground.
continent
(on) land; ground; shore
landing; going ashore; disembarkation
land; shore
landing; alighting; touch down
army
Hokuriku region (of Honshu; incl. Niigata, Toyama, Ishikawa and Fukui prefectures)
takeoff
Rikuō (former province located in parts of present-day Aomori and Iwate prefectures)
Mutsu (former province located in present-day Fukushima, Miyagi, Iwate, and Aomori prefectures)
inland
Sanriku (the three former provinces of Rikuzen, Rikuchū and Rikuō)
land
Hitachi (former province located in the major part of present-day Ibaraki Prefecture)
American continent; the Americas
New World (esp. the Americas, but also Australasia)
Japan Ground Self-Defense Force; JGSDF
takeoff and landing
land and water
land transportation