Meaning of REGION in English
1》 an area of a country or the world having definable characteristics but not always fixed boundaries.
↘an administrative district of a city or country.
2》 a part of the body, especially around or near an organ.
in the ~ of approximately.
ME: from OFr., from L. regio(n-) 'direction, district', from regere 'to rule, direct'.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004