Nagao Bridge, Stone arch bridge in Minamiboso, Japan.

Nagao Bridge is a stone arch bridge in Minamiboso featuring multiple consecutive arches that form a striking linear structure. The construction displays carefully fitted stone blocks assembled using traditional methods from the late 1800s.

Built in March 1888 by local stonemasons, the bridge was funded by donations from area residents totalling 399 yen 40 sen. It withstood the great Nagao River flood of 1917 and the 1923 Great Kanto Earthquake, and Japanese army tanks crossed it during World War II. Minamiboso designated it a town cultural property in 1978 and banned cars; Chiba Prefecture listed it in 1989, and repairs followed from 1993.

Locals call it "Megane-bashi" (Spectacles Bridge) for its three arches mirrored in the water. In 1989 Chiba Prefecture designated it under that nickname as a prefectural tangible cultural property, and the bridge now serves as a symbol for local town-promotion efforts.

You can reach the bridge easily from nearby roads and the surrounding area is good for walking and exploring on foot. Local shops and eateries are located nearby, making it convenient to spend time in the area.

The cut stones in the bridge body are "mizurume stone", quarried at a site called Mizurume on the coastline about 900 m south-southeast of the bridge. Izumi stone was used at the bridge's foot. The 1888 construction cost 399 yen 40 sen, raised by donations from local volunteers.