Udvardy's map of biogeographical provinces. There are three versions of the dataset present. All are in geographic coordinates, WGS84. 1. Udvardy_py - the dataset in its original scale 2. Udvardy_dcw_py - the dataset after having been fitted to the much more detailed 1:1,000,000 scale ESRI Digital Chart of the World dataset 3. Udvardy_py_buf - dataset 2) buffered to approximately 40 km. This dataset will allow the user to create a detailed dataset by using their own more detailed coastal polygon dataset to clip it.