Sumatra Island is a part of which country?

Sumatra Island is a part of which country?

سماٹرا جزیرہ کس ملک کا حصہ ہے؟
Explanation

Sumatra is a large island located in the western part of Indonesia.

This making up approximately 25% of the country's land area.

It is the second-largest island in the Indonesian archipelago.

It is the home to a diverse range of cultures, languages, and natural resources.