  The Luttinger liquid (LL) model of one-dimensional (1D) electronic systems
provides a powerful tool for understanding strongly correlated physics
including phenomena such as spin-charge separation. Substantial theoretical
efforts have attempted to extend the LL phenomenology to two dimensions (2D),
especially in models of closely packed arrays of 1D quantum wires, each being
described as a LL. Such coupled-wire models have been successfully used to
construct 2D anisotropic non-Fermi liquids, quantum Hall states, topological
phases, and quantum spin liquids. However, an experimental demonstration of
high-quality arrays of 1D LLs suitable for realizing these models remains
absent. Here we report the experimental realization of 2D arrays of 1D LLs with
crystalline quality in a moir\'e superlattice made of twisted bilayer tungsten
ditelluride (tWTe$_{2}$). Originating from the anisotropic lattice of the
monolayer, the moir\'e pattern of tWTe$_{2}$ hosts identical, parallel 1D
electronic channels, separated by a fixed nanoscale distance, which is tunable
by the interlayer twist angle. At a twist angle of ~ 5 degrees, we find that
hole-doped tWTe$_{2}$ exhibits exceptionally large transport anisotropy with a
resistance ratio of ~ 1000 between two orthogonal in-plane directions. The
across-wire conductance exhibits power-law scaling behaviors, consistent with
the formation of a 2D anisotropic phase that resembles an array of LLs. Our
results open the door for realizing a variety of correlated and topological
quantum phases based on coupled-wire models and LL physics.
