The largest island in Indonesia is Sumatra. It is notable for its vast tropical rainforests, diverse wildlife, and rich cultural heritage. Sumatra is home to several unique species, including the critically endangered Sumatran orangutan and Sumatran tiger. The island is also known for its stunning landscapes, which include mountains, lakes, and volcanic activity, such as Lake Toba, one of the largest volcanic lakes in the world. Additionally, the island has a rich history of trade and cultural interactions, influencing its diverse population and traditions.