Seoul Forest is a large park in Seongdong District, Seoul, South Korea. It is open year-round, and admission is free. Seoul Forest opened in June 2005. The city government spent 235.2 billion won in development. It is the third largest park in Seoul. Seoul Forest is a massive park dotted with over 420,000 trees and 100 different animals. This nature park is located in Seongsu-dong and covers an area of 1,200 ha.