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}
