Geyve is a municipality and district of Sakarya Province, Turkey. Its area is 662 km2, and its population is 50,799 (2022). The closest international airport is Istanbul Sabiha Gökçen International Airport, 139 km (86 mi) from Geyve. It is the largest district of Sakarya Province in terms of area. Geyve is located at the foot of Geyve Gorge, which is set between two mountain ranges and lies along the Sakarya River. Geyve region has an impressive green landscape and productive nature. Geyve is relatively close to many important cities in Turkey; 179 km (111 mi) to Istanbul, 30 km to Adapazarı, 75 km (47 mi) to Izmit, 139 km to Bursa, 156 km (97 mi) to Eskişehir, 167 km (104 mi) to Bolu by road.