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We report the results of a visual inspection of images of the Rapid ASKAPContinuum Survey (RACS) in search of extended radio galaxies (ERG) that reachor exceed linear sizes on the order of one Megaparsec. We searched a contiguousarea of 1059deg$^2$ from RA$_{\rm J}$=20$^h$20$^m$ to 06$^h$20$^m$, and$-50^{\circ}<\rm{Dec}_J<-40^{\circ}$, which is covered by deep multi-bandoptical images of the Dark Energy Survey (DES), and in which previously onlythree ERGs larger than 1Mpc had been reported. For over 1800 radio galaxycandidates inspected, our search in optical and infrared images resulted inhosts for 1440 ERG, for which spectroscopic and photometric redshifts fromvarious references were used to convert their largest angular size (LAS) toprojected linear size (LLS). This resulted in 178 newly discovered giant radiosources (GRS) with LLS$>$1Mpc, of which 18 exceed 2Mpc and the largest one is3.4Mpc. Their redshifts range from 0.02 to $\sim$2.0, but only 10 of the 178new GRS have spectroscopic redshifts. For the 146 host galaxies the median$r$-band magnitude and redshift are 20.9 and 0.64, while for the 32 quasars orcandidates these are 19.7 and 0.75. Merging the six most recent largecompilations of GRS results in 458 GRS larger than 1Mpc, so we were able toincrease this number by $\sim39\%$ to now 636.

Discovery of 178 Giant Radio Galaxies in 1059 deg$^2$ of the Rapid ASKAP Continuum Survey at 888 MHz