Field observations of the growth fabrics of the fast and near-fast ice along the coasts of the Beaufort and Chukchi seas show that at depths of more than 60 cm below the upper ice surface the sea ice crystals show striking alignments within the horizontal plane. At one site this alignment was well-developed at a depth of 15 cm, and in all cases the degree of preferred orientation increased with depth. In general, the c axes of the crystals were aligned roughly E-W parallel to the coast. In the vicinity of islands, alignment roughly paralleled the outlines of the islands, and in narrow passes between islands the alignment paralleled the channel. Our observations, as well as similar observationsmade in the Kara Sea by Cherepanov, can be explained if it is assumed that the c axes of the crystals are aligned paralled to the 'long-term' current direction at the sea ice-seawater interface. The alignments are believed to be the result of geometric selection among the growing crystals, the most favored orientation being that in which the current flows normal to the (0001) plates of ice that make up the dendritic ice/water interface characteristic of sea ice. It is hypothesized that current flow in this direction reduces the thickness of the solute boundary layer as well as the salinity in the liquid at the interface. This lowered salinity allows crystals in the favored orientation to extend farther into the melt than neighboring crystals with less favored oreintations. In addition, the current tends to induce a continuous flux of supercooled seawater against the sides of the crystals that extend ahead of the interface. This favors their lateral growth. The aligned crystal aggregate that forms has the overall characteristics of a single crystal. The development of such crystal alignments results in pronounced anisotropy in the mechanical, thermal, and electrical properties of fast ice. It is suggested that such crystal orientations can be used as an aid in determining current patterns in perennially ice-covered areas such as the Canadian Archipelago.