When I saw Péter Luffi's WOGE 309 I immediately thought of some of the areas I looked at while searching for WOGE 306, which I eventually found in Greece. I focused my search on that part of the world and after about forty minutes I found the right location just across the border in Albania. However, finding information about the geology took much longer. I was glad that the puzzle had not yet been solved when I finally got back to it.
In keeping with the spirit of Felix Bossert's recent encouragement for new players, I will offer a simple challenge for WOGE 310. If you follow the suggestions he gives, you should be able to find this interesting valley rather quickly. In addition to the location, be sure to tell us something basic about the geologic history. Nothing fancy is required, just a simple explanation of how it was formed. Since this is meant to be an easy WOGE, the Schott Rule is in effect. (Go here for an explanation of WOGE rules.)