Castine, Ohio is a small village located in Darke County. The climate in Castine is characterized as humid continental, with hot summers and cold winters. The hydrology constituents of the area are largely influenced by the Greenville Creek, which flows through the village. Outdoor recreation opportunities in Castine include fishing and boating on the Greenville Creek, as well as hiking and biking on the nearby Greenville Creek Trail. Additionally, the village is located near several state parks and natural areas, providing ample opportunities for outdoor enthusiasts.