Ravines

Ravines are an upcoming feature in Beta 1.8. If you have the pre-release, you can find ravines in creative and survival mode. Ravines are long, narrow canyons that sometimes have waterfalls, lava, coal, and iron ore. Ravines also have tall, dark caves in them and they are also deep so if you come across a ravine and you are not careful, you will fall and die. Most ravines have Mine Shafts in them so if there are mine shafts in them, there ,possibly, might be spiders. so be careful.