Lake Toba 

Known as the largest volcanic lake in the world, Lake Toba stands as a beacon of biodiversity, local culture, and environmental significance. 

The ancient lake was formed by a cataclysmic volcanic eruption over 74,000 years ago and can now be seen in Northern Sumatra from outer space. Spanning 100 kilometres in length, it plays a vital role in supporting the unique ecosystems in and around its waters. 

Lake Toba is oligotrophic, meaning it has a low nutrient supply, yet still provides a home to an incredible range of aquatic and terrestrial species. 

The unique ecosystem also supports many indigenous customs practiced by the local Batak people who hold a deep spiritual and cultural connection to the land and lake, which they consider sacred.