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In page Swist:

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Its source lies at 330 m above sea level (NN) in the northern part of the Eifel in the Ahr Hills, north of the village of Kalenborn in the collective municipality of Altenahr in the county of Ahrweiler. The Swist has an average gradient of 5 ‰ and flows initially to Vettelhoven (Grafschaft) in a northeasterly direction and then descends at a gradient of just 1.3 ‰ through the Fore-Eifel. It continues along the western slopes of the hill ridge Ville in the börde landscape of the Rheinbach Loess Plateau through Meckenheim, Flerzheim, Morenhoven, Heimerzheim and Metternich. At 106 m above NN the Swist empties into the Erft between Weilerswist and Bliesheim.