This lies between the “Muelle Fluvial” and Quay “A”. It is almost triangular in shape, the entrance being 290 m wide; the West quay, 360 m long; the South 80 m; the East (on Quay “A”) 383 meters.
The west side of the basin is used exclusively by the Uruguayan Navy whilst the opposite side of the basin is used by river traffic and has a passenger landing stage for ferryboats as well as two ramps for motor vehicles to roll on and off. The depth here is about 5 m.