Dendropsophus robertmertensi
It is found in the Pacific lowlands of El Salvador , Guatemala , and southeastern Mexico ( eastern Oaxaca , Chiapas ) . 
<triplet> Mexico <subj> Oaxaca <obj> contains administrative territorial entity <subj> Chiapas <obj> contains administrative territorial entity <triplet> Oaxaca <subj> Mexico <obj> located in the administrative territorial entity <triplet> Chiapas <subj> Oaxaca <obj> shares border with