Green Creep is the unintended result of years of mowing; where the edges of greens creep inward or outward, with the putting surface ultimately taking on a new shape. I am looking at a number of greens and this is the most severe case- the 18th green is about 3 feet larger in the front right corner of the green. The solid line is the edge of what will be the approach/collar and the dots represent where the collar and green meet.