The main coffee areas for Arabica are in the Northern part of Sumatra. On this Google Map I marked Takengon city in the north, and Lake Toba in the south.The coffees from around Takengon are Aceh types and account for much of the Mandheling coffee. Lintong is a general name for coffees from the "south" (meaning south of Medan, which is where you fly into to get to the coffee areas).
An interesting 16th - 17th century map of Sumatra
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This page is authored by Thompson Owen and Sweet Maria's Coffee, Inc. and is not to be copied or reproduced without permission