In this episode, students explore the Danube Delta in Romania and the Great Barrier Reef in Australia. Europe’s largest wetlands, the Danube Delta, is a paradise for wild birds. The Danube River is Europe’s second largest river, which originates in Germany’s Black Forest region. The Great Barrier Reef, a 2000-kilometer stretch of colorful coral, is a habitat for various marine creatures. It is situated off the eastern coast of Queensland in northeastern Australia. Part of the “World Heritage” series.