def lat_lon_region(lower_left_corner_latitude,
           lower_left_corner_longitude,
           upper_right_corner_latitude,
           upper_right_corner_longitude):
    """
    Converts a geographical region with lower left corner
    and upper right corner into a Basemap compatible structure.

    :param lower_left_corner_latitude:
        The latitude of the lower left corner.
    :param lower_left_corner_longitude:
        The longitude of the lower left corner.
    :param upper_right_corner_latitude:
        The latitude of the lower left corner.
    :param upper_right_corner_longitude:
        The longitude of the lower left corner.

    :return: A dict with the keys ``llcrnrlat``, ``llcrnrlon``,
             ``urcrnrlat``, and ``urcrnrlon``.
    """
    return {
        'llcrnrlat': lower_left_corner_latitude,
        'llcrnrlon': lower_left_corner_longitude,
        'urcrnrlat': upper_right_corner_latitude,
        'urcrnrlon': upper_right_corner_longitude
    }