This article presents a study of digital mapping narratives as a training tool in second language didactics, enabling students to tell their language biography in a dynamic and multimodal way. To carry out this study, we analyzed a corpus of language biographies (n = 10) produced with the software StoryMap by bilingual students in second language teaching training. The results of our thematic analysis highlight the compositional features of a digital biographical narrative as well as the textual expression of the formal and informal language learning experiences of these future teachers of French as a second language. They show that this type of multimedia writing task enabled them to materialize (through writing, images, geolocation) their linguistic repertoire, to elaborate on their relationship with languages, and to reflect on their language training journey.