it is a waterlily (Nymphaea alba). Lotus have the leaves above the water, and waterlilies have the leaves in contact with the water. Also the lotus flowers have a big pad in the center, and fluted petals." description via https://www.pinterest.com/criticinsatiabl
I love water lilies, even though I don't know where I can see them. It's weird because they seem to be growing on water because they're floating, but their root is truly on the ground. They must have a long stem, in that case ! The picture is from Hau Siu Fai.