The Kocaeli Subregion (Turkish: Kocaeli Alt Bölgesi) (TR42) is a statistical subregion in Turkey.
Provinces
- Kocaeli Province (TR421)
- Sakarya Province (TR422)
- Düzce Province (TR423)
- Bolu Province (TR424)
- Yalova Province (TR425)
See also
External links
- TURKSTAT (in English)
Sources
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