Chilean wine

[avrohom]

I have a friend from Chile. He insists that the Cabernet Sauvignon and/or the Merlot is superior to the French varieties. I tasted several, and noticed that the tanin levels were truly lower than most French counterparts.
He tried to explain that the true difference in Chilean wine depends on which valley it comes from.
My question is, I can't seam to taste any difference between the wine grown in different valleys. Can someone suggest several winesfrom different Chilean vallys that would make it easier for me to understand the subtlties?