Himeji Castle in the context of "Feudal Japan"

Hyōgo Prefecture (兵庫県, Hyōgo-ken; Japanese pronunciation: [çoꜜː.ɡo, -ŋo, çoː.ɡoꜜ.keɴ, -ŋoꜜ.keɴ]) is a prefecture of Japan located in the Kansai region of Honshu. Hyōgo Prefecture has a population of 5,469,762 (as of 1 June 2019) and a geographic area of 8,400 square kilometres (3,200 square miles). Hyōgo Prefecture borders Kyoto Prefecture to the east, Osaka Prefecture to the southeast, and Okayama and Tottori prefectures to the west.

Kobe is the capital and largest city of Hyōgo Prefecture, and the seventh-largest city in Japan, with other major cities including Himeji, Nishinomiya, and Amagasaki. Hyōgo Prefecture's mainland stretches from the Sea of Japan to the Seto Inland Sea, where Awaji Island and a small archipelago of islands belonging to the prefecture are located. Hyōgo Prefecture is a major economic center, transportation hub, and tourist destination in western Japan, with 20% of the prefecture's land area designated as Natural Parks. Hyōgo Prefecture forms part of the Kobe metropolitan area and Osaka metropolitan area, the second-most-populated urban region in Japan after the Greater Tokyo area and one of the world's most productive regions by GDP.

The Japanese Sengoku period from the mid-15th to early 17th century was a time of nearly continual military conflict. Powerful military lords known as daimyōs, such as Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu, struggled to unify Japan. During the Sengoku period, because of constant warfare, many fortifications and castles were built. Archetypal Japanese castle construction is a product of the Momoyama period and early Edo period.

A new era of castle construction began when the daimyo Nobunaga built Azuchi Castle from 1576 to 1579. Earlier fortifications of the Kamakura and Muromachi periods were crude large-scale structures; Azuchi, however, with rich ornamentation and a keep rising seven stories high, became the prototype for castle construction of the period. The style of Azuchi Castle marked a shift in the function of the castles from a place that was merely a fortress and military garrison to a political, cultural and economic center. The newer style castles functioned as home to the daimyōs, his family, and his most loyal retainers. Because of the expense of building such a lavish structure, castles in the style of Azuchi, functioned also to highlight the power and prestige of the daimyōs. These new castles were built of wood and plaster on a stone foundation. Generally the main keep or tenshu was positioned at the highest point, surrounded by a series of interlocking baileys with walls, small towers and pathways. Residential buildings were located in one of the outer circles. The daimyō conducted his business in the citadel.

Japanese castles (城, shiro or jō) are fortresses constructed primarily of wood and stone. They evolved from the wooden stockades of earlier centuries and came into their best-known form in the 16th century. Castles in Japan were built to guard important or strategic sites, such as ports, river crossings, or crossroads, and almost always incorporated the landscape into their defenses.

Though they were built to last and used more stone in their construction than most Japanese buildings, castles were still constructed primarily of wood, and many were destroyed over the years. This was especially true during the Sengoku period (1467–1603), when many of these castles were first built. However, many were rebuilt, either later in the Sengoku period, in the Edo period (1603–1867) that followed, or more recently, as national heritage sites or museums. Today there are more than one hundred castles extant, or partially extant, in Japan; it is estimated that once there were five thousand. Some castles, such as the ones at Matsue and Kōchi, both built in 1611, have main keeps or other buildings that remain extant in their historical forms, not having suffered any damage from sieges or other threats. Hiroshima Castle, on the opposite end of the spectrum, was destroyed in the atomic bombing, and was rebuilt in 1958 as a museum, though it does retain many of its original stone walls.

Matsumoto Castle (松本城, Matsumoto-jō), originally known as Fukashi Castle, is one of Japan's premier historic castles, along with Himeji and Kumamoto. It was the seat of Matsumoto Domain under the Edo Period Tokugawa shogunate. It is located in the city of Matsumoto, in Nagano Prefecture.

The keep (天守閣, tenshukaku), which was completed in the late sixteenth century, maintains its original wooden interiors and external stonework. It is listed as a National Treasure of Japan, and is one of the twelve surviving tenshu in Japan. It is surrounded by four other buildings also designated as National Treasures.

The Shirakami Mountains (White God Mountains) (Japanese: 白神山地, Hepburn: Shirakami-Sanchi) are a UNESCO World Heritage Site wilderness area in the Tōhoku region of northern Honshū, Japan. This mountainous area includes the last virgin forest of Japanese beech which once covered most of northern Japan. The area straddles both Akita and Aomori Prefectures, with three-fourths of it in Aomori Prefecture. Of the entire 130,000-hectare (500 sq mi) area, a tract covering 16,971-hectare (65.53 sq mi) was included in the list of World Heritage Sites in 1993. Fauna found in the area includes Japanese black bear, the Japanese serow, Japanese macaque and 87 species of birds. The Shirakami-Sanchi was one of the first sites entered on the World Heritage List in Japan, along with Yakushima, Himeji Castle, and Buddhist Monuments in the Hōryū-ji Area in 1993. Permission is needed from Forest Management to enter the heart of the Shirakami-Sanchi.

Kumamoto Castle (熊本城, Kumamoto-jō) is a hilltop Japanese castle located in Chūō-ku, Kumamoto, in Kumamoto Prefecture. It was a large and well-fortified castle. The castle keep (天守閣, tenshukaku) is a concrete reconstruction built in 1960, but a number of ancillary wooden buildings remain of the original castle. Kumamoto Castle is considered one of the three premier castles in Japan, along with Himeji Castle and Matsumoto Castle. Thirteen structures in the castle complex are designated Important Cultural Property.

The castles in Top 100 Japanese Castles or 100 Fine Castles of Japan (日本百名城, Nihon Hyaku-Meijō) were chosen based on their significance in culture, history, and in their regions by the Japanese Castle Association (日本城郭協会, Nihon Jōkaku Kyōkai) in 2006.

In 2017, the Japanese Castle Association created an additional finest 100 castles list as Continued Top 100 Japanese Castles.