Youth parade in Perth for Queen Elizabeth II during her visit to Australia

The video showcases a vibrant scene with tens of thousands of lights illuminating St. Georges Terrace. A band of seven gigantic lighted archers adds to the spectacle. The Mile Long Terrace hosts a grand parade featuring 12,000 boys and girls from 49 youth organizations, making it the largest parade after the duck display of the tour.

What does the term 'Mile Long Terrace' refer to in the context of the parade?

What is the relationship between the parade and the duck display mentioned?