  We study physics possibility of Very Long Base-Line (VLBL)
Neutrino-Oscillation Experiments with the High Intensity Proton Accelerator,
which will be completed by the year 2007 in Tokai-village, Japan. As a target,
a 100 kton-level water-Cerenkov detector is considered at 2,100 km away.
Assuming the pulsed narrow-band nu_mu beams, we study sensitivity of such
experiments to the neutrino mass hierarchy, the mass-squared differences, one
CP phase and three angles of the lepton-flavor-mixing matrix. We find that
experiments at a distance 2,100 km can determine the neutrino mass hierarchy if
the mixing matrix element U_{e3} is not too small. The CP phase and U_{e3} can
be constrained if the large-mixing-angle solution of the solar-neutrino deficit
is realized.
