An overview is given of the top-to-bottom flow, thermohaline, oxygen, and nutrient structures between the Bering Sea and the Fiji islands, based on high-resolution field measurements along 179 ¿E. The zonal flow is dominated by a banded mesoscale structure, reflecting the highly sheared structure and instabilities of the major ocean currents crossing the date line. The major midlatitude currents are 100--200 km wide, have maximum speeds of ~40 cm s-1, and extend to ~2000 m, when measured by the 5 cm s-1 isotach. El Ni¿o conditions in 1993 caused a merger of the North Equatorial Countercurrent with the Equatorial Undercurrent, leading to a 600 km wide band of equatorial eastward flow (40--60 cm s-1) in the upper 300 m. Beneath, a 400 km wide and 1.2 km deep westward jet (10--30 cm s-1) is found. Between 1500 and 3500 m the equatorial flow is predominately to the southeast, and between 3500 and 5000 m it is toward the northwest. Consonant with banded shear flow and flow-topography interactions, the physical and chemical property distributions along 179 ¿E are complicated, reflecting the effects of differential property advection, mixing, and water mass transformation. Well-defined property fronts occur in shear zones between currents of different origin. The thermohaline, oxygen, and nutrient tongues associated with North and South Pacific intermediate and deep waters have considerable internal structure, indicative of mesoscale processes and contorted flow paths. The abyssal flow near the date line indicates northward movement of lower circumpolar water to the Hess rise, whence it turns westward and north, west of the Emperor Seamounts; properties east of this seamount chain are very uniform. The deep and abyssal waters of the isolated Aleutian Basin differ substantially from those in the adjacent Pacific, by being warmer (Δ=0.1 ¿C), less saline (Δ=0.01), poorer in oxygen (Δ=50 μmol kg-1), and much richer in silicate (Δ=80 μmol kg-1). An isolated basin within the Wake-Necker Ridge also shows some unusual bottom water characteristics below sill depth. ¿ 2000 American Geophysical Union