Nagaoka is located at the center of Niigata Prefecture and can be reached in about 90 minutes from Tokyo and about 20 minutes from Niigata on the Jo-etsu Shinkansen.
Nagaoka is located at the branching point of Hokuriku Expressway and Kan-etsu Expressway and is thus an important access point for the Sea of Japan coast from both the Tokyo and Osaka areas. Being the center of the Shinanogawa Technopolis, recognized by the Ministry of Economy, Trade and Industry, Nagaoka also values its international and cultural ties.
Please refer the below map :Official Map