def plot_Run1_1p_region(ax):
    """Plot the WFD and uDDF regions for Run1.1p."""
    uddf_ra = [53.764, 52.486, 52.479, 53.771, 53.764]
    uddf_dec = [-27.533, -27.533, -28.667, -28.667, -27.533]

    wfd_ra = [52.25, 52.11, 58.02, 57.87, 52.25]
    wfd_dec = [-27.25, -32.25, -32.25, -27.25, -27.25]

    ax.errorbar(wfd_ra, wfd_dec, fmt='-', color='green',
                label='protoDC2 WFD boundary')
    ax.errorbar(uddf_ra, uddf_dec, fmt='-', color='red',
                label='uDDF boundary')
    return ax