Hario Radio Tower

Hario Radio Tower is a former military radio station in Nagasaki Prefecture, Japan, composed of three concrete towers. Each tower stands at a corner of an equilateral triangle, with sides measuring three hundred meters and the structures rising to a height of one hundred thirty-six meters.

The Japanese Navy built this installation in 1922 to enable long-distance communication across vast areas. During World War II, operators here transmitted the signal that launched the attack on Pearl Harbor.

The towers represent Japan's early 20th-century military infrastructure and maintain status as an Important Cultural Property of Japan.

You can reach the site by taking a bus from Sasebo Bus Terminal to Takahata stop, then walking for about half an hour. The towers stand near Saikai Bridge and are visible from the outside, though the grounds are not fully accessible.

Ruins of the power supply rooms still lie near the towers. This installation is the last surviving long wave communication facility from prewar Japan.

Location: Nagasaki Prefecture

Inception: 1922

GPS coordinates: 33.06651,129.75134

Latest update: December 20, 2025 02:25