Short answers, pulled from the story.
The name Sumatra was first used in international records in 1017 when a local king named Haji Sumatrabhumi sent an envoy to China. Before this date, the region was known to ancient traders and scholars as Suwarnadwipa or Suvarnabhumi, names that reflected the rich gold deposits found in the island's highlands.
Iskandar Muda ruled the Aceh Sultanate during its golden age and extended the cultural influence of the sultanate to Padang and Johor. The Aceh Sultanate sustained a fierce rivalry with the Johor sultanate, the Dutch, and the Portuguese throughout the 16th and 17th centuries.
The Aceh War raged from 1873 to 1903 and was a long and costly conflict between the Dutch Empire and the Aceh Sultanate. This war was not merely a military engagement but a struggle for sovereignty that defined the relationship between the Dutch and the Acehnese people for decades.
The Indian Ocean earthquake struck the western coast and islands of Sumatra on the 26th of December 2004, causing a tsunami that killed more than 170,000 Indonesians. This event was the longest earthquake recorded, lasting between 500 and 600 seconds, and remains one of the deadliest natural disasters in recorded history.
Sumatra has lost almost 50% of its tropical rainforest in the last 35 years, a destruction that has pushed many species to the brink of extinction. The Sumatran tiger, Sumatran rhinoceros, Sumatran elephant, Sumatran ground cuckoo, and Sumatran orangutan are all critically endangered.
The population of Sumatra as of mid 2025 was estimated to be about 62,259,500, making it the fifth-most populous island in the world. The island has an average of about 129 people per square kilometer, with the majority of people being Muslims and the largest indigenous ethnic groups being Malays, Minangkabaus, Bataks, Acehnese, and Lampungs.