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HATSouth is the world's first network of automated and homogeneous telescopesthat is capable of year-round 24-hour monitoring of positions over an entirehemisphere of the sky. The primary scientific goal of the network is todiscover and characterize a large number of transiting extrasolar planets,reaching out to long periods and down to small planetary radii. HATSouthachieves this by monitoring extended areas on the sky, deriving high precisionlight curves for a large number of stars, searching for the signature ofplanetary transits, and confirming planetary candidates with larger telescopes.HATSouth employs 6 telescope units spread over 3 locations with large longitudeseparation in the southern hemisphere (Las Campanas Observatory, Chile; HESSsite, Namibia; Siding Spring Observatory, Australia). Each of the HATSouthunits holds four 0.18m diameter f/2.8 focal ratio telescope tubes on a commonmount producing an 8.2x8.2 arcdeg field, imaged using four 4Kx4K CCD camerasand Sloan r filters, to give a pixel scale of 3.7 arcsec/pixel. The HATSouthnetwork is capable of continuously monitoring 128 square arc-degrees. Wepresent the technical details of the network, summarize operations, and presentweather statistics for the 3 sites. On average each of the 6 HATSouth units hasconducted observations on ~500 nights over a 2-year time period, yielding atotal of more than 1million science frames at 4 minute integration time, andobserving ~10.65 hours per day on average. We describe the scheme of our datatransfer and reduction from raw pixel images to trend-filtered light curves andtransiting planet candidates. Photometric precision reaches ~6 mmag at 4-minutecadence for the brightest non-saturated stars at r~10.5. We present detailedtransit recovery simulations to determine the expected yield of transitingplanets from HATSouth. (abridged)

HATSouth: a global network of fully automated identical wide-field telescopes