名神高速道路
Sekigahara is located in a mountainous valley in far southwestern Gifu Prefecture, which forms a natural bottleneck connecting the Kansai region with the Tōkai region of Japan. The routes of the ancient Nakasendō highway and the modern Meishin Expressway, as well as the Tōkaidō Shinkansen and Tōkaidō Main Line all pass through this area. The town has a climate characterized by hot and humid summers, and mild winters (Köppen climate classification "Cfa"). The average annual temperature in Sekigahara is 14.4 °C. The average annual rainfall is 1908 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.9 °C, and lowest in January, at around 3.2 °C. The mountainous areas of the town are noted for heavy snow in winter.