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We address the flavour composition along the border between the hadronic andthe quark-gluon plasma phases of QCD. The ratio of strange to up and downantiquarks ($\lambda_s$) produced in partic le and nuclear collisions, is foundto increase in collisions with initially reached energy density ($\epsilon_i$)up to $\epsilon_{crit}$ $\sim$ 1 GeV/$fm^3$. Above this value it decreasesapproximately linearly and reaches its asymptotic value at zero baryon chemicalpotential ($\mu_B$). We demonstrate that $\lambda_s$ in nuclear collisions isapproaching its asymptotic value at $\epsilon_i$ $\sim$ 8-9 GeV/$fm^3$,corresponding to $\sqrt{s}$ $\sim$ 3-8 TeV per nucleon+nucleon pair which willbe reached at the LHC. After correcting for the difference in the chemicalpotentials of various colliding systems, $\lambda_s$ universally saturatesacross the QCD phase boundary, following the temperature. Recent experimentalpuzzles as the increase in the $K/\pi$ ratio in Pb+Pb collisions at 40 GeV pernucleon, its different behaviour at midrapidity, the decrease of the doubleratio of $K/\pi$(A+A/p+p) in nucleus nucleus over p+p collisions withincreasing $\sqrt{s}$, and the increase of $\lambda_s$ in p+A over p+pcollisions at the same $\sqrt{s}$, are naturally explained. We study theapproach of thermodynamic observables at $\mu_B=0$ to the transition point andextract an estimate of the critical temperature.Comment: 36 pages, 19 figure

The strange border of the QCD phases