Traveling to Australia, this stop came to Sydney, to the Blue Mountains to punch in. One of the attractions is called "Echo Valley". I saw a sign and knew it was there, but because there is a good squat point for taking pictures of the three sister peaks next to it, so more tourists tend to take pictures of the three sister peaks and ignore this Echo Valley. I looked at it, in fact, here is a valley, it should be if you shout, there will be echo, so it is called "echo valley", but no one called, I am embarrassed to call.