  We determine the scales $r_0$, $r_1$, the ratio $r_0/r_1$ for $N_f$ = 2 + 1
flavor QCD ensembles generated by CLS. These scales are determined from an
improved definition of the static force, which we measure using Wilson loops
and furthermore use to study the shape of the potential. Our analysis involves
various continuum and chiral extrapolations of data that covers pion masses
between 134 MeV and 420 MeV and five lattice spacings down to 0.038 fm.
