Guide
Çatak's hot spring rises near Himmetoğlu village, in a valley between steep slopes 30 km southeast of Göynük. The water, at 32 °C, contains calcium bicarbonate, and the provincial directorate says it helps rheumatism and sciatica. Remains nearby suggest it has been used since Roman times.
When to go
- Climate
- Across Bolu as a whole, monthly mean temperatures run from 0.6 °C in January to 20 °C in August; the mean stays between 15 and 25 °C in June, July, August and September; rainfall is heaviest in May (61 mm) and lightest in August (24 mm). Long-term means for 1929-2025 from the Turkish State Meteorological Service (MGM).
