• Journal of the Speleological Society of Korea
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• no.85
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• pp.18-20
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• 2008

To find out the natural environmental characteristics of Ondal Cave, temperature, humidity, wind speed and water temperature have been investigated. When compared to other caves, in sum, Ondal Cave has shown no significant difference interms of natural environment. Inparticular, Ondal Cave was higher than other limestone caves by 1-2$^{\circ}C$ in terms of water temperature due to high inflow of river water nearby.

• Journal of the Speleological Society of Korea
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• no.85
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• pp.35-37
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• 2008

It's been confirmed that Ondal Cave has gone through secondary cave formations. The comprehensive geological and regional characteristics of Ondal Cave have been investigated. According to the said investigation, geographical features need to be properly used in considerations for natural characteristics by area, and a passage should be developed.

• Journal of the Speleological Society of Korea
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• no.85
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• pp.25-27
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• 2008

Ondal Cave is important and significant in terms of cultural value and tourism. In addition, there are abundant historical and cultural resources nearby. If the geographical strength is taken advantage of, the cave would evolve into a great tourist destination and natural education spot. This paper has investigated humanistic environment of Ondal Cave in considerations for the surrounding tourism resources. There are abundant tourism resources around Ondal Cave. However, they are rarely connected with each other. In fact, they are very partially interrelated around Guinsa(temple) only. Furthermore, the number of tourists has gradually decreased. Therefore, it‘s required to further develop tourism programs and surrounding tourism resources.

• Journal of the Speleological Society of Korea
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• no.61
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• pp.47-64
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• 2000

The Ondal cave, as limestone cave, located in 37$^{\circ}$ 03'N, 128$^{\circ}$ 29'E and in Ha-ri, Yongchun-myeon, Banyans-gun, Chungchongbuk-do. This study analyzed the groundwater of Ondal Cave with 44 items. On investigation almost of items were low and only germs were high than a base numerical value, this is supposedly caused by tourist entrance. For the better management of the Ondal cave the preventing is required.

• Journal of the speleological society of Korea
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• v.42 no.2
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• pp.29-32
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• 1995

The geographical location of Ondal cave is situated between Danyang's cave zone and Yang wol's Kossi cave. The cave is situated at 37$^{\circ}$ 03' North latitude and 128$^{\circ}$ 29' of east longitude and is administratively located in Hari, Yongchun Myen, Danyang Gun, Chung Chong Bug Do. In the light of its natural location, It is situated on the southern side of Nam Han river's water system and in the fort mountain which includes Ondal hill-fort and its mountain range's peak, Nam San.(omitted)

• Journal of the speleological society of Korea
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• no.4
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• pp.11-21
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• 1996

Ondal cave is the limestone and the cultural asset cave designated as Natural monument NO. 261. Originally after the caves included in cultural assets separately survey the academic, cultural value of the cave, the result must be the academic basis of the cave.(omitted)

• Journal of the Speleological Society of Korea
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• no.92
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• pp.55-63
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• 2009

Due to the designated tour route of Ondal cave, it has a specific shape of a tree. The numerical results of Ondal cave's tour route would be suggested as basic data for a comparative analysis between similar caves or a problem identified within the viewing route.

• Journal of the speleological society of Korea
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• no.4
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• pp.3-9
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• 1996

Ondal cave is located in Ha-ri Yongchun - myon, Tanyang - gun, Chungchongbuk - do, which has its site at the valley of southern side of Namhangang which winds up to the southwest. Namsan is kurungbong which is at the mid - slope of the steep and high mountain, Songsan which is 427 m high above sea level, and shows the aspect of the limestone area, a rough and steep mountain one.(omitted)

• Journal of the Speleological Society of Korea
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• no.85
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• pp.15-17
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• 2008

This paper is attempted to review a cave restoration and preservation plan against environmental destruction and pollution as a preliminary survey for preservation of cave environment. Consequently, it's important to throw an indirect light rather than direct light on cave formations, keeping distance of 2m at least. The already existing moss should be removed using wet cloth or sponge as soon as possible. If it's washed off, be careful not to splash it or water on nearby subjects. Based on an automatic switch-off system, light will automatically turn off when no one is left in the cave. It's also recommended to dualize the cave passage and partially close the cave by taking turns to give a time to recover.

• Journal of the Speleological Society of Korea
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• no.89
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• pp.34-36
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• 2008

A total of 19 commercial facilities and 6 agricultural product stores are operated. Among the commercial facilities, restaurants accounted for the greatest portion. Most commercial facilities and agricultural product stores have been owned and run by a local resident.