"What is this very well defined area of dead grass in a park near my home, demarcated by a chalk line?"
A: "This is an out of bounds line for disc golf. Not landscape related. The cement pad is the tee box, and the pole has the tee sign on it. They draw the lines usually for tournaments so there is no maybes about a disc being in or out. It’s out if none of the disc contacts the line or in bound area (the out of bound being the dead grass)"