Samarinda is the provincial capital city of East Kalimantan on the island of Borneo. The riverfront city boasts spectacular views of the sprawling Mahakam River with the enormous Islamic Center mosque towering in the background. The river plays an essential role in the city’s development, including a scenic view, a water source, a support for thriving forests, and an important transport route. Dedicated primarily to coal mining, East Kalimantan is home to 28% of the country’s coal reserves.