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Strong gravitational lensing by galaxy clusters has become a powerful toolfor probing the high-redshift Universe, magnifying distant and faint backgroundgalaxies. Reliable strong lensing (SL) models are crucial for determining theintrinsic properties of distant, magnified sources and for constructing theirluminosity function. We present here the first SL analysis of MACS J0308.9+2645and PLCK G171.9-40.7, two massive galaxy clusters imaged with the Hubble SpaceTelescope in the framework of the Reionization Lensing Cluster Survey (RELICS).We use the Light-Traces-Mass modeling technique to uncover sets of multiplyimaged galaxies and constrain the mass distribution of the clusters. Our SLanalysis reveals that both clusters have particularly large Einstein radii($\theta_E>30"$ for a source redshift of $z_s=2$), providing fairly large areaswith high magnifications, useful for high-redshift galaxy searches ($\sim2$arcmin$^{2}$ with $\mu>5$ to $\sim1$ arcmin$^{2}$ with $\mu>10$, similar to atypical \textit{Hubble Frontier Fields} cluster). We also find that MACSJ0308.9+2645 hosts a promising, apparently bright (J$\sim23.2-24.6$ AB),multiply imaged high-redshift candidate at $z\sim6.4$. These images are amongstthe brightest high-redshift candidates found in RELICS. Our mass models,including magnification maps, are made publicly available for the communitythrough the Mikulski Archive for Space Telescopes.

RELICS: Strong-lensing analysis of the massive clusters MACS J0308.9+2645 and PLCK G171.9-40.7