is a city located in southwestern Hyōgo Prefecture, Japan. , the city had an estimated population of 45,747 in 20563 households and a population density of 360 persons per km². The total area of the city is . Geography Akō is located in far southwestern Hyōgo Prefecture. The city is on the border of the Hyōgo and Okayama prefectures, which also divides the Kinki and Chūgoku areas. On each side of the border, ancient Harima and Bizen provinces, which are now Akō and Bizen cities, respectively (except for the former village of Fukukawa, now part of Akō but formerly belonging to Bizen Province), have cultivated their own cultures. Therefore, even at the present days, dialects are vastly different on the sides of the border. A traveller from west to east on the JR San'yō Main Line will notice that the dialect of passengers suddenly changes between Kamigori station in Hyogo prefecture and Mitsuishi station in Okayama prefecture. In Akō, people speak a type of the Kansai dialect whose intonation is however of the Tokyo type. The superset of the dialect spoken in Akō, called Banshū-ben, is known as one of the harshest-sounding dialects. The Chikusa River flows through the center of the city, providing the moat of Akō Castle with water through a branch, Kariya River. The central part of the city around the castle has been built on the alluvial plain of Chikusa River. Parts of the city are within the borders of the Setonaikai National Park. Neighboring Municipalities Hyōgo Prefecture Aioi Kamigōri Okayama Prefecture Bizen Climate Akō has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Akō is 15.1 °C. The average annual rainfall is 1519 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.1 °C, and lowest in January, at around 4.8 °C. Demographics Per Japanese census data, the population of Akō has remained relatively constant over the past 40 years. History Akō was part of ancient Harima province, and has been settled since at least the Jomon period, with numerous remains from the Yayoi period and Kofun period found within city limits. During the Edo period, Akō was a capital of Akō Domain, which was noted for its salt production. The town Akō was created with the establishment of the modern municipalities