Reading the post above which locates Santa Ana Maya I searched to find the other places mentioned in the story. It says it was written in Tepalcatepec. It says it was in the Apatzingan Valley. One bad area was said to be Vista Hermosa. And the killing was in Santa Ana Maya. Below I list the Lat Lon of each of these places.
Only Apatzingan is in Valle Apatzingan (my map shows Rio Apatzingan so this is probably the valley mentioned).
Telalcatepec is NW of there and does not appear to be in this valley.
Santa Ana Maya is way east and on the north shore of Lake Cuitzeo.
Vista Hermosa is near the east end of Lake Chapala.
Only Tepalcatepec and Apatzingan are near each other and they are about 30 miles apart as the crow flies. The others are 100 miles – a little more or less – from each other.
Copy & Paste the below numbers to Google Earth to locate these places if you are interested.
Tepalcatepec . . . 19.18818 -102.84516
Apatzingan . . . 19.05813 -102.33025
Vista Hermosa . . . 20.27261 -102.47790
Santa Ana Maya . . . 20.00774 -101.02107