Helen Mills (born in Johannesburg, South Africa; lives in Toronto, ON, Canada) is the founder of Lost Rivers, a project of the Toronto Green Community. When she came to Toronto, she noticed a sunken park near her house. Years later she learned that it was a remnant ravine and home to lost Mud Creek. Mesmerized, she wanted to paint blue lines on the street and over buildings, to name the creeks and bring them back to the surface of our awareness. Then the Lost River Walks began through the alchemy of the very first public meeting of the Toronto Green Community (1994). More than 33,000 people have walked on a Lost River since then.