Systematic field observations from 2019 to 2021 of bats from Northwest Jutland, Denmark provided by Biologisk Forening for Nordvestjylland (BFN), National Park Thy, Danish Nature Agency in Thy and Thisted Municipality all in Denmark. A total of 195389 observations represented in 6859 records of data. Region boundary northwest: 57.07° North. 8.28° East. Region boundary southeast: 56.79° North. 8.68° East.