IPA: /ˈflætˌlændər/
KK: /ˈflætˌlændər/
A person who lives in a low-lying area, especially in contrast to those who live in mountainous regions.
The flatlander found it difficult to adjust to the high altitude of the mountains.
Flatlander → It is formed from "flat" (from Old English *flaet*, meaning level or even) and "lander" (from the Old English *land*, meaning land or territory, combined with the agent suffix "-er", meaning a person who). The term refers to a person from a flat or level area, typically used to describe someone from a region that lacks significant elevation.
Think of someone from a 'flat' ('flaet') area, and the '-er' means a person. A flatlander is someone who comes from a flat land.