In (Arthurian) adventures, space is traversed in loops. The ‚Lancelot en prose‘ realizes this basic condition of movement according to the conventions of Arthur’s court while overcoming it at the same time. This article begins by tracing the modes of movement through the forest, which typically appears as a space of danger, on the basis of the Middle High German (and Old French) text. On the one hand, it is the woods which evoke knightly adventures in the first place, but on the other hand it is also the woods which impede these adventures in the thicket and displace them to the clearings. The many obstacles within the forest seem to bar the way for straightforward progress and urge the knight to move in loops. A second part examines the drastic consequences that await heroic knights beyond adventure when, at the end of the ‚Queste del Saint Graal‘, adventure proves to be an exhaustible resource, and the loops must open into the void or infinity. Narratologically, both transformations of the adventurous loops prove precarious as they make the necessary telling of the adventure impossible, unless the events can be guaranteed by the relic of a loop. In the case of Lancelot, Bohort returning from the Grail Orient would act as a „guarantor“.