What Is a Waterfall Countertop? A waterfall countertop continues vertically down one or both sides of the island, creating the appearance of the surface flowing toward the floor. This seamless detail highlights the beauty of the material and gives the island a clean, luxurious finish. In this kitchen, the striking veining travels across the expansive countertop and down both sides of the island. The result is a dramatic frame that contrasts beautifully with the dark cabinet