more on the umbrella line

please click on this photo in order to see where exactly the lifeguard is sitting in relation to the umbrellas.

so the umbrella line is an imaginary line that runs in between those yellow umbrella line signs in the sand. this line designates the point at which no umbrellas are allowed to pass. this is so the lifeguards view remains unobstructed while he surveys the ocean of swimmers, keeping them safe. this is clearly illustrated in the above photograph where you can see the lifeguard sitting in his chair in front of all of the beautiful umbrellas.