Abukuma-do

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Abukuma-do
The Takine Palace
Location	Honshū, Japan
Nearest city	Tamura-shi, Fukushima Prefecture
Coordinates	37°20′41″N 140°40′24″E / 37.344717°N 140.673472°E / 37.344717; 140.673472
Visitors	10,085,000 (in 1988)

Abukuma-do (あぶくま洞 - Abukuma Cave) is a limestone cave located in Fukushima Prefecture, Japan. The cave was discovered on August 15, 1969, northeast of the city of Tamura and was originally named Kamayama Shonyu-do (釜山鍾乳洞). It was designated a natural heritage of the town on February 7, 1971, and renamed Abukuma-do on June 1, 1973.^[1] Visitors can traverse a 600-metre-long path inside the cave as well as a 120-metre-long exploration course to view the stalactites and stalagmites. Each stalactite has taken more than eighty million years to form.^[2] Beyond the public areas lie about 2,500 metres of cave that are not open to the public. Nearby Abukuma Cave is the smaller Irimizu Shonyu-do (入水鍾乳洞 - Irimizu Limestone Cave), discovered in 1927. Irimizu Limestone Cave was designated a National Natural Treasure on December 28, 1934.^[3] The temperature inside Abukuma-do is approximately 15 °C and the humidity is above 90%.