Ami Seaplane Base

Military Demobilization. The facility was part of the Imperial Japanese Navy's Kasumigaura Naval Air Group. It ceased all operations following Japan's surrender at the end of World War II and the subsequent dissolution of the Japanese Imperial military.

The former seaplane base site has been completely redeveloped. The area is now primarily occupied by Kasumigaura Park, a public recreational area that includes the Kasumigaura City Aquarium and a large windmill which is a local landmark. Some of the original concrete foundations and seaplane slipways from the naval era are still preserved and visible along the shoreline within the park, serving as historical monuments. The former land-based portion of the air group is now the site of the Japan Ground Self-Defense Force (JGSDF) Camp Kasumigaura.

The location was the seaplane component of the Kasumigaura Naval Air Group, a premier air training facility for the Imperial Japanese Navy (IJN) established in 1922. It was one of the largest and most important aviation centers in pre-war Japan, serving as the primary training ground for IJN pilots, observers, and aircraft mechanics. The base on Lake Kasumigaura was specifically used for training on and operating a wide variety of seaplanes, floatplanes, and flying boats. The adjacent land airfield famously hosted the German airship Graf Zeppelin during its round-the-world flight in August 1929. The entire complex was a cornerstone of Japan's naval aviation power leading up to and during WWII.

There are no known plans or prospects to reopen the site as a seaplane base or any other type of aviation facility. The current land use as a public park and its proximity to an active military base make any future aviation-related redevelopment extremely unlikely.