In this file, you can see several examples of "inner" used with the region of Ma'rib:

https://unhabitat.org/sites/default/files/2021/04/210408_mar...

Page 54:
The remaining IDPs (71K) live in the urban areas,
either in “inner Marib” (i.e. the small town and the city
center area), or in “outer Marib” (which is a minor city
expansion in the north that has seen a massive growth
over the past five years).

Page 55:
This suburb became
a major attraction for IDP communities, who
wanted to invest in a permanent residence and
sought affordability when they compared rental
or purchase prices in the inner Marib area.

You can also say it different ways, such as:
A village in Ma'rib's interior...

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Note added at 11 days (2021-12-24 14:41:17 GMT) Post-grading
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Glad I could assist!