Plan your visit to Danyang Ondaldonggul Cave in Chungcheongbuk-do. Find visitor information, location details and HANKATONG CARD payment information.
About Danyang Ondaldonggul Cave
Ondaldonggul Cave is located underground at the foot of Seongsan Mountain, where Ondalsanseong Fortress is situated. It is a natural limestone cave that is estimated to have begun forming around 450 million years ago. The total 760 meter-long cave covers an area of 349,485 square meters.
The cave mouth is two meters high, while the cave itself is 5 to 10 meters high and about 5 meters wide. The cave features stairway structure and contains an abundance of beautiful stalagmites and stalactites. The average temperature of the cave maintains 14 degrees Celsius in summer and 16 degrees Celsius in winter, making it a perfect all-year-round attraction.
The cave is rich in underground water resources and there is a 0.8 to 1 meter-deep cave river flowing at the bottom of the cave floor. The cave also has over 40 small ponds that are inhabited by a variety of living organisms like fish and insects. Situated on top of the mountain peak to the left of the cave is Ondalsanseong Fortress.
The fortress has been preserved in its original form throughout some 1,400 years and shows the advanced building skills of Goguryeo Era (37 BC-668 AD). The annual Ondal Culture Festival is held every October around Ondaldonggul Cave and Ondalsanseong Fortress in memory of the legendary love story between General Ondal and Princess Pyeonggang. Other attractions in the area include a theme park and Jangseung (Korean traditional totem poles) Park.
Visitor information
- Address
- 23 Ondal-ro, Yeongchun-myeon, Danyang-gun, Chungcheongbuk-do
- Opening hours (KST)
- Summer Season: 09:00-18:00 / Winter Season: 09:00-17:00
* Last admission is one hour before closing. - Closed
- N/A (Open all year round)
- Parking
- Available
- Contact
- +82-43-423-8820
- Official website
- Visit the official website
Getting there
Get directions to Danyang Ondaldonggul Cave.
Danyang Ondaldonggul Cave FAQs
What are the opening hours?
Summer Season: 09:00-18:00 / Winter Season: 09:00-17:00
* Last admission is one hour before closing.
When is it closed?
N/A (Open all year round)
Can I use HANKATONG CARD at Danyang Ondaldonggul Cave?
Yes. You can use your HANKATONG CARD at this location. Top up online in your own currency before you pay.
Where can I get HANKATONG CARD?
Get your HANKATONG CARD and check the current card price, delivery options and top-up information on the card page.
Photos and source
© Korea Tourism Organization (한국관광공사) / Korea Tourism Content Lab. KOGL Type3
Place information: Korea Tourism Organization, English TourAPI. HANKATONG CARD acceptance information: AllTripThings. Retrieved November 10, 2026.