  We examine the possibility of constraining the cosmological mean mass and
dark energy densities by an application of the Alcock-Paczynski test on
redshifted 21-cm maps of the epoch of reionization. The 21-cm data will be
provided as a function of frequency and angular positions on the sky. The ratio
of the frequency to angular distance scales can be determined by inspecting the
anisotropy pattern of the correlation function of brightness temperature. We
assess the sensitivity of the distance ratio to the cosmological parameters and
present a technique for disentangling geometrical distortions from redshift
space distortions caused by peculiar motions.
