Donghae-si is a city in Gangwon Province, South Korea. There are two major ports: Donghae Harbor and Mukho Harbor. The city is located on the Yeongdong Line railroad and the Donghae Expressway. Numerous caverns are found in the city, as in neighboring Samcheok.
Sea Train is a tourist train, travelling along the Western sea, comprised of four divided cabins including two special rooms, one standard room, and one family room. The first and second cabin feature a special themed cabin equipped with movie-watching system and seats facing the windows. The third car is for family members prepared with table seats, general subway-alike seats, and a cafeteria. The fourth cabin is for groups featuring three-seated and two-seated chairs. The Sea Train has plenty of things to see as it was decorated with a marine theme, including trick art images of clams, ocean creatures and shark as well as unfolded ocean views looking through the windows. Also, monitors equipped inside the room broadcasts music and games that will provide a fun entertainment while in the train. Another interesting feature of the train is the colorful lights that will change its color to green, red, and blue while passing through a tunnel.
Hwanseongul Cave is the biggest lime stone cave in Korea. Its length is 6.5 km and it features fantastic stalagmites, stalactites, and about 10 lakes and waterfalls. Some spots of interest include stalactites that look like the Great Wall of China and many other uniquely shaped figures.
The mercury inside of the cave keeps it at a cool 12-24℃ in the summer and 8-9℃ in the winter. It takes about 30-40 minutes to the entrance and approximately one hour to look around the cave. Keep in mind that the steep slope at the entrance may be difficult for the elderly and young children.