Location: MX-166 and Cll. Zaragoza, Santa Teresa, Mpo. Pilcaya As Mexico 166 begins we’ll enter unincorporated Santa Teresa. Location: MX-166 at the Morelos Line, Mpo. Pilcaya A kilometer later, Mexico 166 enters Morelos.  E to MX-95  S to MX-55, N to MEX State Line