Langinkoski Rapids is a natural water feature located in Finland, specifically in the Kymijoki River. It is known for its beautiful scenery and is a popular spot for fishing and outdoor activities. The rapids are characterized by their fast-flowing water and rocky landscape, making it a picturesque destination for nature lovers. The area surrounding Langinkoski is also historically significant. It was once the summer residence of Tsar Alexander III of Russia, who enjoyed the tranquil environment. Today, the site is part of the Langinkoski Nature Reserve, which aims to preserve its unique ecosystem and promote recreational use.