Devin is located in the central part of the Rhodope Mountains in the valley of the Vacha River, 45 km from the city of Smolyan. Devin is also at a distance of 220 km from Sofia and 70 km from Plovdiv. The town itself is located in the vicinity of the popular ski resort of Pamporovo which is 35 km east of Devin.
The Devinska river runs through it and numerous other brooks and rivers (namely Krichim, Muglenska and Trigradska) are found nearby, all tributaries of the Vacha river. The altitude is uneven owing to the mountainous location, ranging from 684 m to around 800 m above sea level