World's Slowest Landslide Has a Great Name

Actually, I don't know this is the world's slowest landslide, but it sounds likely:

William H. Schulz and Jason W. Kean of the United States Geological Survey, with Gonghui Wang of Kyoto University in Japan, studied the Slumgullion slide in the San Juan Mountains of Colorado. This slide is 2.5 miles long, about 350 yards wide and 65 feet thick at its lower end, and moves an average of about a half-inch a day. Because it moves so slowly, it is not hazardous (although it will wipe out a state highway in about 100 years) and is ideal for study.