Loch Dubh nestles in a wooded valley called Gleann Dubh at a height of about 140 metres above sea level. It is 4 kilometres east of Scotland's most popular Munro, Ben Lomond (974 m), one kilometre south of Beinn Dubh (508 m), 1½ kilometres northeast of Beinn Bahn (569 m) and five kilometres west northwest of Kinlochard near the head of Loch Ard.