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AIMS. We present a new Ks-band survey that represents a significant extensionto the previous wide-field Ks-band imaging survey within the 0226-04 field ofthe VIMOS-VLT deep survey (VVDS). The new data add ~ 458 arcmin^2 to theprevious imaging program, thus allowing us to cover a total contiguous area of~ 600 arcmin^2 within this field. METHODS. Sources are identified both directlyon the final K-band mosaic image and on the corresponding, deep chi^2-g'r'i'image from the CFHT Legacy Survey in order to reduce contamination whileensuring us the compilation of a truly K-selected catalogue down to thecompleteness limit of the Ks-band. The newly determined Ks-band magnitudes areused in combination with the ancillary multiwavelength data for thedetermination of accurate photometric redshifts. RESULTS. The final cataloguetotals ~ 52000 sources, out of which ~ 4400 have a spectroscopic redshift fromthe VVDS first epoch survey. The catalogue is 90% complete down to K_Vega =20.5 mag. We present K_s-band galaxy counts and angular correlation functionmeasurements down to such magnitude limit. Our results are in good agreementwith previously published work. We show that the use of K magnitudes in thedetermination of photometric redshifts significantly lowers the incidence ofcatastrophic errors. The data presented in this paper are publicly availablethrough the CENCOS database.

The VIMOS VLT Deep Survey: The K-band follow-up in the 0226-04 field