1.7.10 seed. Hole to enter ravine, where other ravines intersect, found about 5 different ravines, might be more. Some are small and some are big. Biome is Extreme Hills so there must be emerald ore. Becareful not to loose yourself, good luck! Update: As I played, I found two dungeons! And there are way more than 5 ravines, as you mine, ravines just keep showing up. So far more than 10 ravines.