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Cheongok Golden Bat Cave in Donghae is the only natural cave in Korea located in a downtown area. Estimated to have been created 400 to 500 million years ago, the cave is known to serve as a habitat for the endangered golden bats. The cave's total length stretches for 1,510 meters, with only 810 meters of the cave open to the public while the rest of cave remains protected for preservation purposes. The cave features ceiling craters, one of which is the longest in Korea, along with stalactite curtains, travertine terraces, stalactite cascades, and many other fantastic rock formations. The cave's unique features provide a grand spectacle for tourists and great speleological samples for researchers. A 785-meter walkway was made using the sinkhole created by dissolved limestone to help visitors get a better understanding of cave formations.

This is the only limestone cave located in the middle of an urban area in Korea. Situated in the center of Donghae-si, Gangwon-do, the cave was accidentally discovered during apartment construction in 1991 and has been open to the public since 1996. It is known to be home to the golden bat, a globally endangered species. The golden bat, which has a deep orange color, is a rare species designated as both first-class endangered wildlife and a natural monument. The cave is 1,510 meters long, but only 810 meters are open to visitors, with the rest preserved for conservation. Visitors can see extraordinary cave formations such as large stalactites hanging from the ceiling, stalagmites rising from the floor, and pillars formed by stalactites and stalagmites connecting. The ceiling also features Korea's largest ceiling corrosion gully. The adjacent nature experience park adds to the educational value. A 785-meter doline trail (a funnel-shaped limestone depression formed by water erosion) allows easy understanding of cave formation, and visitors can rest at a wildflower experience park blooming with over 100 species.

Cheongok Golden Bat Cave Nature Learning Experience Park was created to provide a comprehensive view of the doline terrain that holds the secrets of cave formation. The park features a lawn plaza, azalea field, walking trails, daylily garden, silver grass field, spring scent, rock garden, summer and autumn scents, outdoor learning center, dolines, cave entrance, and doline exploration trail. The doline exploration trail includes a 534m wooden deck installed along the doline, allowing observation of the dolines around Cheongok Golden Bat Cave and the natural vegetation of the Uvala area. The doline resting area offers close-up views of the doline terrain, with wildflower experience park and views of the East Sea and the distant Mukho lighthouse. The wildflower experience park, planted with about 100 species and 50,000 wildflowers and trees, provides visitors with sights and relaxation and harmonizes with the doline trail, making it a popular complex tourism theme site. The outdoor learning center hosts experiential events for visitors and citizens and is designed to aid understanding of wildflowers. Cheongok Golden Bat Cave Nature Learning Experience Park includes exercise equipment and spacious benches, making it a great picnic spot for families, couples, and friends. Cheongok Golden Bat Cave is unique in Korea for being located in an urban area, maintaining an annual temperature of 14-15°C, offering coolness in summer and warmth in winter.

Hapyeonghaebyeon Beach is a tranquil beach with a shallow shore lined with pine groves. The beach is only 20 minutes away on foot and 10 minutes' ride from Donghae Express Bus Terminal, making it a great beach destination for family vacationers and tourists. The 20-meter wide shoreline is 200 meters in lenth, all covered with white sand. The beach also has rocks along the coast that act as a natural breakwater, preventing rough waves from entering the shore, ensuring a safe and enjoyable environment for swimming.