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We report SOFIA-upGREAT spectroscopic imaging of the [C II] 158um spectralline, as well as a number of [O I] 63um spectra, across a 67x45 pc field towardthe Sgr B region in our Galactic center. The fully-sampled andvelocity-resolved [C II] images have 0.55 pc spatial and 1 km/s velocityresolutions.  We find that Sgr B extends as a coherent structure spanning some 34 pc alongthe Galactic plane. Bright [C II] emission encompasses Sgr B1 (G0.5-0.0), theG0.6-0.0 HII region, and passes behind and beyond the luminous star formingcores toward Sgr B2 (G0.7-0.0). Sgr B is a major contributor to the entireGalactic center's [C II] luminosity, with surface brightness comparable to [CII] from the Arches region.  [C II], 70um, and 20cm emission share nearly identical spatial distributions.Combined with the lack of [C II] self-absorption, this indicates that theseprobes trace UV on the near surfaces of more extended clouds visible in COisotopologues and 160um continuum. Stars from regions of local star formationlikely dominate the UV field. Photodissociation regions and HII regionscontribute similar amounts of [C II] flux.  The extreme star formation cores of Sgr B2 contribute negligible amounts tothe total [C II] intensity from the Sgr B region. Velocity fields andassociation with a narrow dust lane indicate that they may have been producedin a local cloud-cloud collision. The cores are likely local analogs of theintense star formation regions where ideas to explain the "C+ deficit" inultra-luminous galaxies can be tested.

SOFIA-upGREAT imaging spectroscopy of the [C II] 158um fine structure line of the Sgr B region in the Galactic center