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Filaments are a ubiquitous morphological feature of the molecularinterstellar medium and are identified as sites of star formation. In recentyears, more than 100 large-scale filaments (with a length $>10$\,pc) have beenobserved in the inner Milky Way. As they appear linked to Galactic dynamics,studying those structures represents an opportunity to link kiloparsec-scalephenomena to the physics of star formation, which operates on much smallerscales. In this letter, we use newly acquired Outer Galaxy High ResolutionSurvey (OGHReS) $^{12}$CO(2-1) data to demonstrate that a significant number oflarge-scale filaments are present in the outer Galaxy as well. The 37 filamentsidentified appear tightly associated with inter-arm regions. In addition, theirmasses and linear masses are, on average, one order of magnitude lower thansimilar-sized molecular filaments located in the inner Galaxy, showing thatMilky Way dynamics is able to create very elongated features in spite of thelower gas supply in the Galactic outskirts.

OGHReS: Large-scale filaments in the outer Galaxy