The Hangang river is the most beautiful river that runs across the Seoul city and it offers a very picturesque view of Seoul city. Hangang river is one of the peak destinations during summer as it offers lot of activities from water sports, cycling to even rock climbing. If you are not the adventure types then you can come visit Hangang just for a walk or just sit by the river and watch the water sparkling with reflection at night. For pictures you can visit this link - <a href="http://www.thekoreaguide.com/2010/08/19/ja-bol-lae-observatory-seoul-%EC%9E%90%EB%B2%8C%EB%A0%88-%EC%A0%84%EB%A7%9D%EB%8C%80/">Hangang River in Seoul</a> and for video watch this by <a href="http://www.thekoreaguide.com/2010/10/27/me-on-arirang-tv-korea/">Korea Tourism Organization</a>