Nagaokakyō Shi served as Japan's capital from 784 to 794, predating the long-standing Heian-kyō (modern Kyoto) and establishing a brief but significant period in national history.

Emperor Kanmu moved the capital to Nagaokakyō from Nara (Heijō-kyō) to escape the powerful influence of Buddhist temples and to seek a more auspicious and strategically advantageous location.

The capital's tenure was brief, lasting only ten years, reportedly due to a series of natural disasters, the assassination of a key official (Fujiwara no Tanetsugu), and the perceived inauspiciousness of the new site, leading to a swift relocation to Heian-kyō.

Geographically, Nagaokakyō is situated in the southwestern part of Kyoto Prefecture, bordered by the Katsura River to the east and nestled against the foothills of the Nishiyama Mountains, providing a scenic backdrop.

As of recent estimates, Nagaokakyō has a population exceeding 80,000 residents, having experienced steady growth as a residential and commuter town for people working in the larger urban centers of Kyoto and Osaka.

The city is a significant industrial hub, particularly known for its robust electronics manufacturing sector, hosting facilities of major international companies like Murata Manufacturing.

Beyond electronics, Nagaokakyō's economy also includes important sectors such as precision machinery manufacturing and food processing, contributing to a diversified and resilient industrial base.

The Nagaokakyo Bamboo Festival (Nagaokakyo Take matsuri), held annually in May, is a famous cultural event that celebrates the city's renowned bamboo groves and rich bamboo culture with various traditional performances and crafts.

The Nagaoka-kyō Daidairi Site, comprising the former imperial palace and government administrative complex, is a nationally designated historic site where archaeological excavations continue to reveal crucial remnants of the ancient capital.

Shoryuji Castle Ruins, once a strategic fortress during the Sengoku period and a key battleground, is now a public park showcasing remnants of the castle walls and moats, offering historical insights and recreational space.

Honkatsura-ji Temple, founded in the 8th century, boasts significant cultural properties and is considered one of the earliest temples directly associated with the Nagaoka-kyō capital period, preserving ancient Buddhist heritage.

The region is particularly renowned for its high-quality bamboo shoots (takenoko), which are a celebrated local specialty and a staple in the city's culinary traditions, attracting visitors for their fresh taste.

Following its abandonment as a capital, Nagaokakyō gradually evolved from primarily agricultural land into a modern residential and industrial city, experiencing significant urban development, especially in the post-war era.

While Nagaokakyō Shi itself does not contain a UNESCO World Heritage Site, its profound historical significance as an ancient capital forms an integral part of the broader historical context of Kyoto Prefecture, which is home to numerous such sites.

Its strategic location along major transportation routes, including the JR Kyoto Line and expressways, facilitates excellent accessibility to central Kyoto and Osaka, reinforcing its role as a key satellite city for commerce and habitation.