Musi (mōˈsē) [key], river, c.325 mi (520 km) long, rising in the Pegunungan Barisan, S Sumatra, Indonesia. It flows SE to Palembang (head of oceangoing navigation), then northeast through the swampy coastal plain to the Bangka Strait. The Rawas River is its chief tributary. Rubber and a variety of tropical crops are raised in the valley.
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