Olive growing in Kocaeli
Marmara region · 626 t of olives and 3 t of olive oil in 2025-26.
In the 2025-26 season Kocaeli harvested 626 tonnes of olives from 31.000 bearing trees — an average of 20.5 kg per tree. Of that crop 610 t went to the table and 16 t to pressing, yielding 3 tonnes of olive oil.
Where it stands
- 8 of 9 in the Marmara region — 0.2% of the region's crop, 0.0% of Turkey's
- 20.5 kg per tree — 8.0 kg above the regional average of 12.5 kg
- 97% of the crop goes to the table (regional average 41%) — table-oriented
The homeland of Karamürsel Su
Kocaeli's place in olive growing comes not from the size of its output but from being the homeland of a variety: Karamürsel Su originates in the province's Karamürsel district, where it is also known as su zeytini (water olive).
Olives are grown around Gölcük and Karamürsel, alongside other crops. Samanlı and Çelebi are also recorded here.
⚠ In parts of Marmara exposed to northerly winds the trees suffer cold damage in some years, and Kocaeli sits in that belt. The olive's chilling requirement become decisive here.
2025-26 season
| Bearing trees | 31.000 |
| Olives | 626 t |
| To the table | 610 t (%97) |
| For oil | 16 t |
| Olive oil | 3 t |
| Per tree | 20.5 kg |
Only the current season is published for this province; the multi-season series exists for İzmir, Aydın, Manisa, Muğla, Bursa and Çanakkale.
Geographical indications
The registration belongs to the product of a defined area, not to the variety wherever it grows.
- Karamürsel Samanlı Zeytini geographical indication · reg. no 1622
Varieties of the Marmara region
Varieties are recorded by region in the source, not by province.