un lopin de terre
The French translation of "by land" is: par terre.
un terrain plat
Terre
atterrissage
a land = une terre terre
You are probably thinking of the phrase "pied a terre" (literally, foot to ground, meaning enough ground to stand on).
pays des palmiers
'abyss' is translated 'les profondeurs' or 'les abysses' (a bit poetic) in French
land, it comes from latin or french
le coucher du soleil, or 'le crépuscule' (a bit literary)
"La terre" ("the land" but it's important to remember that it's a feminine word)
The word "plateau" comes from the French word for "tableland," which is "plateau." It refers to a flat and elevated area of land that is typically surrounded by steep slopes or cliffs.