The ornamental design for a boat, as shown and described.
1. Boat
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Top
1.5 : Bottom
1.6 : Left
1.7 : Right
The present design is characterized in that seats are located in a crescent-moon-shaped structure; and a motor assembly supplying power to a boat is provided in a bottom part of a boat which is configured to be parallel to surface of the water, such that it looks like a crescent moon is floating or slipping on the surface of the water when a boat is on the water.