The Plitvice Lakes National Park is a stunning natural wonder located in the mountainous region of Croatia. It is a UNESCO World Heritage Site and is one of the oldest national parks in Southeast Europe. The park is known for its sixteen beautiful lakes, interconnected by a series of cascading waterfalls
From Wikipedia
Plitvice Lakes National Park is one of the oldest and largest national parks in Croatia. In 1979, Plitvice Lakes National Park was inscribed on the UNESCO World Heritage list, for its outstanding and picturesque series of tufa lakes, caves, and connected waterfalls.