From Middle English mydlonde, equivalent to mid- +‎ land.

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midland (plural midlands)

1. The region of a country not near the borders; the interior.
   • 2007, Kye-hyŏng Pak, A Life, →ISBN, page 166:

     The City of Daejeon: the capital of Choongnam Province in the midland of Korea, now it is expanded to be a Metropolitan City.

• Northern Midlands
• Southern Midlands

midland (not comparable)

1. Resembling or relating to the interior region of a country.

• There are several towns (and regions of the United States and United Kingdom) named Midland or Midlands.