Nagato is located in northwestern Yamaguchi. The north side faces the
Sea of Japan, and the coastline facing the open sea is eroded terrain. On the other hand, there are coves such as Fukagawa Bay and Senzaki Bay, which are surrounded by the island of Ōmijima and the mainland, and Aburaya Bay, which is surrounded by the Mukatsugu Peninsula, which are good natural harbors. Since the Mukatsugu Peninsula has little flat land, there are many terraced rice fields. The southern part of the city is on the western edge of the
Chūgoku Mountains, and snow can be seen in the mountainous areas. However, due to the influence of the
Tsushima Current, it does not get extremely cold even in winter, and because the altitude is not so high, the number of snowy days is not so many. Nagato also encompasses
Ōmijima Island in the Sea of Japan, which is connected by a large road bridge which connects the Senzaki Peninsula with the southern edge of the island. Much of the island is within the borders of the
Kita-Nagato Kaigan Quasi-National Park. ==Neighboring municipalities==