is a town located in Chiba Prefecture, Japan. , the town had an estimated population of 7,743 in 3240 households and a population density of 120 persons per km<sup>2</sup>. The total area of the town is .
Located in the mountainous terrains that divides the Bà Âsà  Peninsula, Chà Ânan has relatively little flat land. Like other municipalities in the region, the town maintains agricultural reservoirs. Several golf courses dot the landscape. Chà Ânan is located in the southeastern part of Chiba prefecture, about 25 kilometers from the prefectural capital at Chiba, and 50 to 60 kilometers from the center of Tokyo.
Chiba Prefecture
Chà Ânan has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Chà Ânan is 15.1 ðC. The average annual rainfall is 1684 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.9 ðC, and lowest in January, at around 5.3 ðC.
Per Japanese census data, the population of Chà Ânan has declined over the past 70 years.
Chà Ânan is rich in archeological sites from the Jà Âmon period, Yayoi period, and Kofun period periods. Under the ritsuryà  reforms of the Nara period the area of present-day Chà Ânan became part of Kazusa Province. Two Tendai Buddhist temples were established in this period, Kasamori-ji and Chà Âfuku-ji. At the end of the Heian period the area came under the control of the military leader Taira no Tadatsune, and his descendants continued their control of the area in the Kamakura period. In the 1456 the Takeda clan built Chà Ânan Castle as an extension of the larger Mariyatsu Castle. After the establishment of the Tokugawa shogunate Chà Ânan became a major distribution center of goods, most notably salt, passing through the Bà Âsà  Peninsula. The modern town of Chà Ânan was created on February 11, 1955, from the merger of the former town of Chà Ânan with neighboring villages of Nishimura, Higashimura and Toyosaka.
Chà Ânan has a mayor-council form of government with a directly elected mayor and a unicameral town council of 13 members. Together with the other municipalities in Chà Âsei District, Chà Ânan contributes one member to the Chiba Prefectural Assembly. In terms of national politics, the town is part of Chiba 11th district of the lower house of the Diet of Japan.
The principal agricultural output of Chà Ânan is rice, and shiitake mushrooms and lotus root are cultivated in the town. There are also some small-scale dairy farms.
Chà Ânan has one public elementary school and one public middle school operated by the town government. The town does not have a public high school.
Chà Ânan does not have any passenger railway service.