  Recent extensive, multi-color deep surveys of galaxies open a possibility to
get observational estimation of sizes for the largest structures in the
Universe. Photometric redshift accuracy (about 0.03(1+z)) allows directly study
clustering at scales about 1000 Mpc. Thanks to large number of galaxies in each
redshift bin one may detect super-large structures if they really exist. Here
we show that the observed behavior of the redshift distribution of galaxies in
deep surveys such as HUDF and FDF is consistent with existence of super-large
structures of luminous matter with scales about 2000 Mpc. We detect a large
underdense region in radial galaxy distribution at redshift interval z=1.2 -
2.2 which separate our "Local Hubble Volume" from the neighboring over-density
region at z=2.2 - 3.5. This result can also explain the observed deficiency of
gamma ray sources at redshift about 2. Observational test on the reality of the
supper-large structures may be obtained by organizing sky covering net (cells
about 10n x 10n degrees) of very deep narrow angle (1n x 1n arc-minutes)
multi-band photometric surveys of galaxies which is achievable for large
ground-based telescopes.
