Toyama Prefecture (富山県) is a prefecture of Japan located in the Chūbu region of Honshu. Toyama Prefecture has a population of 1,053,555 (2018) and has a geographic area of 4,247 km 2 (1,639 sq mi). Toyama Prefecture borders Ishikawa Prefecture to the west, Gifu Prefecture to the south, Nagano Prefecture to the east, and Niigata Prefecture to the northeast.
Toyama is the capital and largest city of Toyama Prefecture, with other major cities including Takaoka, Imizu, and Nanto. Toyama Prefecture is part of the historic Hokuriku region, and the majority of prefecture's population lives on Toyama Bay, one of the largest bays in Japan. Toyama Prefecture is the leading industrial prefecture on the Japan Sea coast and has the advantage of cheap electricity from abundant hydroelectric resources. Toyama Prefecture contains the only known glaciers in East Asia outside of Russia, first recognized in 2012, and 30% of the prefecture's area is designated as national parks.
Historically, Toyama Prefecture was Etchū Province. Following the abolition of the han system in 1871, Etchū Province was renamed Niikawa Prefecture, but Imizu District was given to Nanao Prefecture. In 1872 Imizu District was returned by the new Ishikawa Prefecture.
In 1876, Niikawa Prefecture was merged into Ishikawa Prefecture but the merger was void in 1881 and the area was re-established as Toyama Prefecture.
The Itai-itai disease occurred in Toyama around 1950.