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Extreme, young stellar populations are considered the primary contributor tocosmic re-ionization. How Lyman-continuum (LyC) escapes these galaxies remainshighly elusive, and it is challenging to observe this process in actual LyCemitters without resolving the relevant physical scales. We investigate theSunburst Arc: a strongly lensed, LyC emitter at $z =2.37$ that reveals anexceptionally small scale (tens of parsecs) region of high LyC escape. Thesmall ($<$ 100 pc) LyC leaking region has extreme properties: a very blue UVslope ($\beta = -2.9 \pm 0.1$), high ionization state ([O III]$\lambda 5007$/[OII]$\lambda 3727 $ $= 11 \pm 3$ and [O III]$\lambda 5007$/H$\beta$ $=6.8 \pm0.4$), strong oxygen emission (EW([O III]) $= 1095 \pm 40 \ \r{A}$), and highLyman-$\alpha$ escape fraction ($0.3 \pm 0.03$), none of which are found innon-leaking regions of the galaxy. The leaking region's UV slope is consistentwith approximately ``pure'' stellar light that is minimally contaminated bysurrounding nebular continuum emission or extinguished by dust. These resultssuggest a highly anisotropic LyC escape process such that LyC is produced andescapes from a small, extreme starburst region where the stellar feedback froman ionizing star cluster creates one or more ``pencil beam'' channels in thesurrounding gas through which LyC can directly escape. Such anisotropic escapeprocesses imply that random sightline effects drive the significant scattersbetween measurements of galaxy properties and LyC escape fraction, and thatstrong lensing is a critical tool for resolving the processes that regulate theionizing budget of galaxies for re-ionization.

Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties