Olmec heartland
The Olmec heartland is the southern portion of Mexico's Gulf Coast region between the Tuxtla mountains and the Olmec archaeological site of La Venta , extending roughly 80 km ( 50 mi ) inland from the Gulf of Mexico coastline at its deepest . 
<triplet> Gulf Coast region <subj> Mexico <obj> country <triplet> La Venta <subj> archaeological site <obj> instance of <triplet> Gulf of Mexico <subj> Mexico <obj> country