This article examines the passage XXXIX, 35 from Notitia Dignitatum, the only literary source referring to the fleet commander in the Roman province of Scythia. The document mentions the praefectus of the fleet and two types of naval units under his control. Several questions can be raised about the status of the commander, the place where he or she resided, the nature and attributions of the fleet. Although the text has been studied by many historians, several reading proposals being advanced, the issue of the military fleet on the Scythian border remains open.