Sawahlunto is a city in West Sumatra, Indonesia. It lies 90 kilometres from Padang, the provincial capital. Sawahlunto is known as the site for the oldest coal mining site in Southeast Asia. Sawahlunto is geographically located in a narrow valley along the Bukit Barisan mountains and surrounded by several hills, namely Bukit Polan, Bukit Pari, and Bukit Mato. The town has a land area of 273.45 sq. km, and had a population of 56,866 at the 2010 Census, 60,136 at the 2015 Census, and 65,138 at the 2020 Census; the official estimate as at mid-2022 was 66,413 - comprising 33,430 males and 32,983 females.

The Ombilin Coal Mine is a coal mine near Sawahlunto, West Sumatra, Indonesia. It is located in a narrow valley along the Bukit Barisan mountains, among the Polan, Pari, and Mato hills, approximately 70 kilometres (43 mi) northeast of Padang. Coal was discovered in the mid-19th century by Willem Hendrik de Greve, and mining began in the area in 1876. The mine is the oldest coal mining site in Southeast Asia.