Cheonggyecheon is a 10.9-kilometre-long (6.8 mi), modern public recreation space in downtown Seoul, South Korea.
There is famous Cheongye stream, and not so famous cheongye plaza.
You can go to Cheonggyecheon Stream by Seoul Subway. You can take the Subway Line 5 to Gwanghwamun Station and then exit 5. Another way is you can take the Seoul Subway Line 1 or 2 to City Hall Station and then exit 4.