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All answers having "Region" as clue:

4 Character Answers:

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ALTO

AREA

BELT

GROW

KEEP

LAND

PART

TERR

ZONE



5 Character Answers:

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CLIME

PARTS

PLACE

REALM

TRACT



6 Character Answers:

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DOMAIN

IGNORE

NETHER

SECTOR

UNITED



7 Character Answers:

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DEMESNE

LOWLAND

TERRAIN



8 Character Answers:

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DISTRICT

LOCALITY



9 Character Answers:

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TERRITORY



11 Character Answers:

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STETHOSCOPE