 The temperature inside Abukuma-do is around 15 °C and the humidity is above 90%.Abubukuma-dong was discovered in September 1969 from the present Busan quarry site in an area called Abukuma Highlands (阿武隈高地), or Harachitai highlands (原地帯), in the middle of a plateau of geologic formation of irregular limestone deposits, on the west side slope of Mt.Otakine.