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Hoengseong (횡성군, 橫城郡, side.castle.county) is a county in Gangwon-do. The population as of 2004 was 44,557, including:
- 44,297 Koreans and
- 260 non-Koreans.
- Area: 997.89㎢
- Population density: 45/㎢(2002.12)
- Number of households: 15,722(2002.12)
- Administrative divisions: 1 eup, 8 myeon
- Location of county office: 58-1 Eupha 1-ri, Hoengseong-eup, Hoengseong-gun (횡성군 횡성읍 읍하1리 58-1)
- County flower: 함박꽃
- County tree: Zelkova (느티나무)
- County bird: 백로
To the north is the county of Hongcheon, to the west is the county of Yangpyeong in Gyeonggi-do, to the south is the city of Wonju and the county of Yeongwol, and to the east is the county of Pyeongchang.
There are a number of large mountains in the region, such as Balgyosan (발교산, 髮校山:998m) to the north, Taegisan (태기산, 泰岐山:1,261m), Cheongtaesan (청태산, 靑太山:1,200m) and Sajasan (사자산, 獅子山:1,120m) to the east, and Chiaksan (치악산, 雉岳山:1,288m) and Namdaebong (남대봉, 南臺峰:1,182m) to the south.
Hoengseong is located far from the sea and thus has a more extreme climate than most parts of the country. The average yearly temperature is 10.7℃, the average in January is －6.3℃, and the average in August is 25.5℃. The average yearly precipitation is 1,140mm.
Buses leave regularly for Wonju (시외터민알), taking about 25 minutes. A taxi should cost W15,000.
There is a Lotteria and a few chicken/pizza places in Hoengseong-eup. The local specialty is beef (한우) and array of beef restaurants on the north side of the downtown area. Many of these places serve Gomtang (곰탕) which is Seollongtang with a fried egg on top. There is also a reasonable street market in the centre of town.
There is a selection of motels around the central area.
Hoengseong Oncheon is located in Gapcheon-myeon. Seongwoo resort is loacted in Dunnae-myeon.
Anheung-myeon is famous for Anheung steamed bread.