MH_WATERLAND - Western marsh harriers (Circus aeruginosus, Accipitridae) breeding near the Belgium-Netherlands border is a bird tracking dataset published by the Research Institute for Nature and Forest (INBO). It contains animal tracking data collected by the LifeWatch GPS tracking network for large birds (http://lifewatch.be/en/gps-tracking-network-large-birds) for the project/study MH_WATERLAND, using trackers developed by the University of Amsterdam Bird Tracking System (UvA-BiTS, http://www.uva-bits.nl). The study was operational from 2013 until 2018. In total 7 individuals of western marsh harrier (Circus aeruginosus) have been tagged in their breeding area near the Belgium-Netherlands border (provinces of East Flanders in Belgium and Zeeland in the Netherlands), mainly to study their habitat use and migration behaviour. Data are uploaded from the UvA-BiTS database to Movebank and from there archived on Zenodo (see https://github.com/inbo/bird-tracking). No new data are expected. See Milotic et al. (2020, https://doi.org/10.3897/zookeys.947.52570) for a more detailed description of this dataset. Data in this package are exported from Movebank study MH_WATERLAND - Western marsh harriers (Circus aeruginosus, Accipitridae) breeding near the Belgium-Netherlands border (Movebank Study ID 604806671), which can be viewed at https://www.movebank.org/cms/webapp?gwt_fragment=page=studies,path=study604806671. Attributes in the data files are defined in the README.txt, in the NERC Vocabulary Server at http://vocab.nerc.ac.uk/collection/MVB and in the Movebank Attribute Dictionary at www.movebank.org/node/2381. Files README.txt: information regarding the terms of use as well as the attributes of the data files, which are defined in the Movebank Attribute Dictionary (https://www.movebank.org/node/2381). MH_WATERLAND-reference-data.csv: reference data about the animals, tags and deployments. MH_WATERLAND-gps-yyyy.csv: GPS data recorded by the tags, grouped by year. ; This dataset was collected using infrastructure ...