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Background: Numerous studies have explored the impact of pre- and post-migration factors on the overall health of migrant populations. The objective of this study is to enhance our understanding of additional determinants affecting migrants' health by examining the impact of the migration phase and related journeys in the European context., Methods: We conducted a systematic review of studies published in the MEDLINE, Embase, and Scopus databases from 2003 up to January 5, 2024. We included observational studies reporting information on the health status of migrant populations recorded upon arrival in a country situated in Europe, and on the transit phase, including specific risk factors experienced during the journey or its characteristics. Title and abstract screening were performed using active learning techniques provided by ASReview software. The results of the included studies were presented qualitatively, with a focus on publications that formally assessed the association between the journey and the investigated health outcomes. The systematic review was registered on PROSPERO, CRD42024513421., Results: Out of 11,370 records screened, we ultimately included 25 studies, all conducted since 2017. Most adopted a cross-sectional design and a quantitative approach, with relatively small sample sizes. The majority of the studies were conducted in Serbia and Italy. Only 14 of them formally assessed the association between different exposures in the transit phase and health outcomes, including mental health, well-being and quality of life, infectious and non-communicable diseases., Conclusion: Epidemiological research focusing on the transit phase in Europe remains limited, with few available studies facing challenges related to data collection, study design and analysis, thereby limiting the interpretability and generalisability of their results. These findings underscore the need for action, prompting the development of adequate and feasible strategies to conduct additional studies focusing on migrant populations during migration journeys., (© 2024. The Author(s).)