def remove_oversea_areas(df, lat=[36, 72], lon=[-10.6, 31]):
    """
    Remove plants outside continental Europe such as the Canarian Islands etc.
    """
    df = df.loc[df.lat.isnull() | df.lon.isnull() | (df.lat >= lat[0]) & (
        df.lat <= lat[1]) & (df.lon >= lon[0]) & (df.lon <= lon[1])]
    return df
