  We report on a recent study of the ground-state octet baryon masses using the
covariant baryon chiral perturbation theory with the extended-on-mass-shell
renormalization scheme up to next-to-next-to-next-to-leading order. By
adjusting the available 19 low-energy constants, a good fit of the $n_f=2+1$
lattice quantum chromodynamics results from the PACS-CS, LHPC, HSC, QCDSF-UKQCD
and NPLQCD collaborations is achieved.
