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We have analyzed the double-lined eclipsing binary system ASAS J180057-2333.8from the All Sky Automated Survey (ASAS) catalogue . We measure absolutephysical and orbital parameters for this system based on archival $V$-band and$I$-band ASAS photometry, as well as on high-resolution spectroscopic dataobtained with ESO 3.6m/HARPS and CORALIE spectrographs. The physical andorbital parameters of the system were derived with an accuracy of about 0.5 -3%. The system is a very rare configuration of two bright well-detached giantsof spectral types K1 and K4 and luminosity class II. The radii of the stars are$R_1$ = 52.12 $\pm$ 1.38 and $R_2$ = 67.63 $\pm$ 1.40 R$_\odot$ and theirmasses are $M_1$ = 4.914 $\pm$ 0.021 and $M_2$ = 4.875$\pm$ 0.021 M$_\odot$ .The exquisite accuracy of 0.5% obtained for the masses of the components is oneof the best mass determinations for giants. We derived a precise distance tothe system of 2.14 $\pm$ 0.06 kpc (stat.) $\pm$ 0.05 (syst.) which places thestar in the Sagittarius-Carina arm. The Galactic rotational velocity of thestar is $\Theta_s=258 \pm 26$ km s$^{-1}$ assuming $\Theta_0=238$ km s$^{-1}$.A comparison with PARSEC isochrones places the system at the early phase ofcore helium burning with an age of slightly larger than 100 million years. Theeffect of overshooting on stellar evolutionary tracks was explored using theMESA star code.

The Araucaria Project. Accurate stellar parameters and distance to evolved eclipsing binary ASAS J180057-2333.8 in Sagittarius Arm