is the capital city of KÃ Âchi Prefecture located on the island of Shikoku in Japan. With over 40% of the prefectural population, KÃ Âchi is the main commercial and industrial centre and the "primate city" of the prefecture. , the city had an estimated population of 311,224 in 163,479 households, and a population density of 1,000 persons per km<sup>2</sup>. The total area of the city is .
A symbol of the city is its most famous dish, katsuo tataki, made by lightly searing and seasoning bonito.
KÃ Âchi is located on the southern coast of KÃ Âchi Prefecture, facing the Pacific Ocean to the south. The city area can be divided into three distinct geographic sections. The urban centre lies at the head of Urado Bay, in a narrow alluvial plain crossed by several rivers, notably the Kagami River and Kokubu River. The plain is bounded by mountains to the north and a range of hills to the south and west.
The northern mountains form the least densely populated part of the city, with the only settlement being along narrow river valleys. The highest point in KÃ Âchi is Kuishi-yama at .
To the south of the city centre, Urado Bay cuts through the hills to its outlet into the Pacific Ocean. The land surrounding the bay and a small strip of the coastline form the third part of the city. This area, although hillier and less dense than the plain, is nevertheless a major location of housing and port-related industry.
KÃ Âchi Prefecture
Kà Âchi has a very wet humid subtropical climate (Köppen climate classification Cfa), receiving twice as much rainfall as Shikoku's other chief cities Matsuyama and Takamatsu. It is also the most typhoon-prone of Japan's major cities owing to its location directly exposed to the open Pacific Ocean from which the storms enter the country, and has twice received over of rainfall in a day from a typhoon.
Per Japanese census data, the population of KÃ Âchi increased rapidly in the 1960s and 1970s before peaking around the year 2000 and going into decline.
As with all of Kà Âchi Prefecture, the area of Nahari was part of ancient Tosa Province. The river plain now containing the city centre was originally settled as a castle town around Kà Âchi Castle, the seat of the daimyà  of Tosa Domain. The castle site was chosen by Yamauchi Kazutoyo in 1601 to replace the earlier seats of the Chà Âsokabe clan who had previously ruled in province. The city takes its name from that of the castle. As the centre of administration for the province, and the prefecture which succeeded it, the town rapidly grew to become the largest settlement of the region.
During the time of the Meiji Restoration, KÃ Âchi became famous as a centre of pro-imperial ideology, and later for incubating democratic and human rights movements. The city was incorporated on April 1, 1889, with the establishment of the modern municipalities system..
Tram service began in the city on May 2, 1904, and the city was connected to the national rail network on November 12, 1951.
KÃ Âchi was selected as a target by the United States' XXI Bomber Command because of the city's status as a prefectural capital, and the fact that it was a centre for industry and commercial trade. On July 3, 1945, at 6:22 pm (JST) 129 aircraft took off to bomb KÃ Âchi. 1060 tons of incendiary bombs were dropped on KÃ Âchi, destroying 48% of the built up areas of the city, killing 401 civilians and rendering over 40,000 homeless.
On April 1, 1998, the city was designated as the first core city on Shikoku.
On January 1, 2005, the villages of Kagami and Tosayama, both from Tosa District were merged into KÃ Âchi.
On January 1, 2008, the town of Haruno (from Agawa District) was also merged into KÃ Âchi.
KÃ Âchi has a mayor-council form of government with a directly elected mayor and a unicameral city council of 42 members. The current mayor (since 2023) is Ryugo Kuwana.
KÃ Âchi contributes 15 members to the KÃ Âchi Prefectural Assembly. In terms of national politics, the city is divided between the KÃ Âchi 1st district and KÃ Âchi 2nd districts of the lower house of the Diet of Japan.
KÃ Âchi is home to two universities, KÃ Âchi University (national) and University of Kochi (prefectural), and four junior colleges including Kochi Junior College.
KÃ Âchi has 39 public elementary schools, 17 public middle schools and one public high school operated by the city government, one private and one national elementary school, and five private combined middle/high schools. The city has eight public high schools administered by the KÃ Âchi Prefectural Department of Education. The prefecture also operates one middle school and one combined middle/high school.
KÃ Âchi is located on the JR Shikoku's Dosan Line connecting it to northern Shikoku, and via interchanges with the Tosa Kuroshio Railway to the eastern and western parts of KÃ Âchi Prefecture. JR's central station in KÃ Âchi is KÃ Âchi Station.
Shikoku Railway Company JR Shikoku Dosan Line
The most visible form of transport within Kà Âchi is the tram service run by Tosaden Kà Âtsà «. Its three lines with historic cars service the major northâÂÂsouth and eastâÂÂwest axes of the city.
The city also has an extensive bus network.
KÃ Âchi is also serviced by the KÃ Âchi interchange of the KÃ Âchi Expressway which connects to the national expressway system.
KÃ Âchi Castle still exists in its pre-restoration form, and is one of the main tourist attractions. Other places of interest in the city centre are the shopping arcade, the regular Sunday street markets which are close to a kilometre in length, and , a bridge that featured in a famous KÃ Âchi song about the forbidden love of a Buddhist priest.
The mountain holds a public park with views of the city, and is home to stop 31 on the Shikoku Pilgrimage, Chikurin-ji, as well as the Makino Botanical Garden.
Off Museum Road (Kenritsu Bijutsukandori) is The Museum of Art, KÃ Âchi, where the main collection is composed of expressionistic works related to KÃ Âchi.
The Former Yamauchi Residence and Tosa Yamauchi Family Treasury and Archives are also to be found in the city.
The Shinto Shrine Tosa jinja is located to the west.
Temples No.30 (Zenrakuji, No.31(Chikurin-ji) and No.33 (Sekkei-ji) on the Shikoku Pilgrimage are located in the city.
At the mouth of Urado Bay, the remnants of Urado Castle (an earlier provincial seat) stand above Katsurahama, a famous beach with an aquarium and statue of the Kà Âchi hero Sakamoto Ryà Âma.
Nearby on the grounds is the Sakamoto Ryà Âma Memorial Museum.
KÃ Âchi's most famous festival is the Yosakoi which is held in August. Teams of dancers dance to traditional and modern songs at various places around KÃ Âchi. The total number of dancers is in the thousands.