Pure gauge lattice QCD at arbitrary D is considered. Exact integration
over link variables in an arbitrary D-volume leads naturally to an ap
pearance of a set of surfaces filling the volume and gives an exact ex
pression for functional of their boundaries. The interaction between e
ach two surfaces is proportional to their common area and is realized
by a non-local matrix differential operator acting on their boundaries
. The surface self-interaction is given by the QCD(2) functional of bo
undary. Partition functions and observables (Wilson loop averages) are
written as an averages over all configurations of an integer-valued f
ield living on a surfaces.