Why is the outline of the Biosphere so irregular?

The boundary of the proposed biosphere reserve defines the watershed for the Bras d’Or Lake. It is a line that joins the high points of land all around the Lake. If rain falls inside the line, it runs toward the Lake. If it falls outside the line, it drains away from the Lake. We chose the waterhsed boundary because everything inside that line potentially impacts the Lake itself. The total area represents an ecological functioning unit.