The authors use a new deprojection formula to infer the gravitational potential around isolated galaxies from weak gravitational lensing, revealing circular velocity curves that remain flat for hundreds of kpc, extending the classic result from 21 cm observations. There is no clear indication of a decline out to 1 Mpc, well beyond the expected virial radii of dark matter halos. Binning the data by mass shows a correlation with the flat circular speed that closely agrees with the Baryonic Tully-Fisher Relation (BTFR) known from kinematic data. These results apply to both early and late-type galaxies, indicating a common universal behavior. The circular velocity curves are consistent with being flat out to hundreds of kpc, possibly up to 1 Mpc, with no sign of reaching the edge of the dark matter halo. The weak-lensing BTFR is fully consistent with the kinematic BTFR, suggesting that galaxies inevitably lie on the BTFR given the availability of an adequate tracer to measure the circular velocity at large radii. The findings are challenging to understand within the Lambda Cold Dark Matter (ΛCDM) framework but are consistent with predictions from Modified Newtonian Dynamics (MOND).The authors use a new deprojection formula to infer the gravitational potential around isolated galaxies from weak gravitational lensing, revealing circular velocity curves that remain flat for hundreds of kpc, extending the classic result from 21 cm observations. There is no clear indication of a decline out to 1 Mpc, well beyond the expected virial radii of dark matter halos. Binning the data by mass shows a correlation with the flat circular speed that closely agrees with the Baryonic Tully-Fisher Relation (BTFR) known from kinematic data. These results apply to both early and late-type galaxies, indicating a common universal behavior. The circular velocity curves are consistent with being flat out to hundreds of kpc, possibly up to 1 Mpc, with no sign of reaching the edge of the dark matter halo. The weak-lensing BTFR is fully consistent with the kinematic BTFR, suggesting that galaxies inevitably lie on the BTFR given the availability of an adequate tracer to measure the circular velocity at large radii. The findings are challenging to understand within the Lambda Cold Dark Matter (ΛCDM) framework but are consistent with predictions from Modified Newtonian Dynamics (MOND).