The Coulomb drag between two spatially separated one-dimensional(1D) electron systems in lithographically fabricated 2 µm longquantum wires is studied experimentally. The drag voltage VDshows peaks as a function of a gate voltage which shifts theposition of the Fermi level relative to the 1D subbands. Themaximum in VD and the drag resistance RD occurs when the 1Dsubbands of the wires are aligned and the Fermi wave vector issmall. The drag resistance is found to decrease exponentially withinterwire separation. In the temperature region 0.2 K⩽T⩽1 K, RD decreases with increasing temperature in a power-law fashion RD∝Tx with x ranging from -0.6to -0.77 depending on the gate voltage. We interpret our data interms of the Tomonaga-Luttinger liquid theory.