The Balearic basin is a semi-enclosed basin located in the western Med
iterranean Sea, connecting the Gulf of Lions and the Alboran basin. Wh
ile the characteristics and circulation of the water masses have been
rather well established, the exchanges with adjacent basins, essential
to our understanding of the circulation in the western Mediterranean
and for validating outputs of general circulation models, have never b
een determined in detail. We present here the data from the FE-89 (Jun
e 1989) Spanish cruise, during which high-resolution CTD and ADCP meas
urements were performed on the open boundaries of the Balearic basin.
The fluxes for all the boundaries were calculated in a quasi-synoptic
fashion. The values found in the Ibiza and Mallorca channels contrast
with those given by other authors. The cruise also allowed us to sampl
e and determine the main characteristics of the Balearic front; the as
sociated current flows SW to NE along the Balearic shelf, and the tran
sport found is about 0.75 Sv. In contrast with the findings from previ
ous analyses, these results suggest that the Balearic front is a perma
nent feature.