The third dataset of ”The Breeding Bird Atlas of Japan”

From 2016 to 2021, we completed the third survey of "The Breeding Bird Atlas of Japan". We conducted two complete survey courses within each cell of a 20km square mesh (total 2344 courses) placed as a graticule over the map of Japan. In addition to field surveys, literature information and bird observation records were collected and compiled to determine the status of birds in each 20km mesh cell. We release this dataset with the intention of providing useful data to researchers and conservationists, who may conduct various analyses to evaluate the distribution of birds in Japan during this period.