  The Extended Chandra Deep Field-South (ECDFS) survey consists of 4 Chandra
ACIS-I pointings and covers $\approx$ 1100 square arcminutes ($\approx$ 0.3
deg$^2$) centered on the original CDF-S field to a depth of approximately 228
ks. This is the largest Chandra survey ever conducted at such depth, and only
one XMM-Newton survey reaches a lower flux limit in the hard 2.0--8.0 keV band.
We detect 651 unique sources -- 587 using a conservative source detection
threshold and 64 using a lower source detection threshold. These are presented
as two separate catalogs. Of the 651 total sources, 561 are detected in the
full 0.5--8.0 keV band, 529 in the soft 0.5--2.0 keV band, and 335 in the hard
2.0--8.0 keV band. For point sources near the aim point, the limiting fluxes
are approximately $1.7 \times 10^{-16}$ $\rm{erg cm^{-2} s^{-1}}$ and $3.9
\times 10^{-16}$ $\rm{erg cm^{-2} s^{-1}}$ in the 0.5--2.0 keV and 2.0--8.0 keV
bands, respectively. Using simulations, we determine the catalog completeness
as a function of flux and assess uncertainties in the derived fluxes due to
incomplete spectral information. We present the differential and cumulative
flux distributions, which are in good agreement with the number counts from
previous deep X-ray surveys and with the predictions from an AGN population
synthesis model that can explain the X-ray background. In general, fainter
sources have harder X-ray spectra, consistent with the hypothesis that these
sources are mainly obscured AGN.
