Some experts believe that you also get circulating air patterns in the atmosphere above the boundary between the water and the land and this can initiate thunderstorms and showers.

BBC: Reservoirs can make local flooding worse, says study

Ahead of this week's ministerial meeting, the federal government announced changes it wanted made to the Boundary Waters Treaty in order to prevent bulk water exports, and referred the Lake Superior case to the International Joint Commission, which deals with boundary waters.

ECONOMIST: Canada��s water

Even measuring the boundary of a static body of water is no mean feat.

ECONOMIST: Beno?t Mandelbrot

She took a green flatboat across the 4-feet of water on the school's campus to Tulane's boundary.

CNN: A momma's love

When swimmers spread their fingers just right, each individual digit forms its own boundary layer, as if it's "dressed in a sleeve of water that moves with the finger, " Bejan said.

MSN: Fastest swimmers make webbed hands out of water