Nagaoka is a city located in the Niigata Prefecture in the Koshinetsu region of Japan. It is known for its rich history, beautiful natural landscapes, and vibrant cultural scene. The city is situated along the Shinano River and is surrounded by picturesque mountains, making it a popular destination for outdoor enthusiasts. Nagaoka is also famous for its traditional festivals, such as the Nagaoka Fireworks Festival, which is one of the largest fireworks displays in Japan. The city is also home to several historical sites, including the ruins of Nagaoka Castle and the Echigo Hillside Park, which offers stunning views of the surrounding countryside.