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We present the most extensive and detailed reddening maps of the MagellanicClouds (MCs) derived from the color properties of Red Clump (RC) stars. Theanalysis is based on the deep photometric maps from the fourth phase of theOptical Gravitational Lensing Experiment (OGLE-IV), covering approximately 670deg2 of the sky in the Magellanic System region. The resulting maps providereddening information for 180 deg2 in the Large Magellanic Cloud (LMC) and 75deg2 in the Small Magellanic Cloud (SMC), with a resolution of 1.7x1.7 arcminin the central parts of the MCs, decreasing to approximately 27x27 arcmin inthe outskirts. The mean reddening is E(V-I) = 0.100 +- 0.043 mag in the LMC andE(V-I) = 0.047 +- 0.025 mag in the SMC. We refine methods of calculating the RCcolor to obtain the highest possible accuracy of reddening maps based on RCstars. Using spectroscopy of red giants, we find the metallicity gradient inboth MCs, which causes a slight decrease of the intrinsic RC color withdistance from the galaxy center of ~0.002 mag/deg in the LMC and between 0.003and 0.009 mag/deg in the SMC. The central values of the intrinsic RC color are0.886 and 0.877 mag in the LMC and SMC, respectively. The reddening map of theMCs is available on-line both in the downloadable form and as an interactiveinterface.

OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Cloud from Red Clump Stars