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In this paper we describe the survey design for the Ultradeep NIRSpec andNIRCam ObserVations before the Epoch of Reionization (UNCOVER) Cycle 1 JWSTTreasury program, which executed its early imaging component in November 2022.The UNCOVER survey includes ultradeep ($\sim29-30\mathrm{AB}$) imaging of$\sim$45 arcmin$^2$ on and around the well-studied Abell 2744 galaxy cluster at$z=0.308$ and will follow-up ${\sim}500$ galaxies with extremely deeplow-resolution spectroscopy with the NIRSpec/PRISM during the summer of 2023.We describe the science goals, survey design, target selection, and planneddata releases. We also present and characterize the depths of the first NIRCamimaging mosaic, highlighting previously unparalleled resolved and ultradeep 2-4micron imaging of known objects in the field. The UNCOVER primary NIRCam mosaicspans 28.8 arcmin$^2$ in seven filters (F115W, F150W, F200W, F277W, F356W,F410M, F444W) and 16.8 arcmin$^2$ in our NIRISS parallel (F115W, F150W, F200W,F356W, and F444W). To maximize early community use of the Treasury data set, wepublicly release full reduced mosaics of public JWST imaging including 45arcmin$^2$ NIRCam and 17 arcmin$^2$ NIRISS mosaics on and around the Abell 2744cluster, including the Hubble Frontier Field primary and parallel footprints.

The JWST UNCOVER Treasury survey: Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization