A buoy is a floating device that is anchored to the bottom of a body of water and used to mark a specific location. Buoys are often used in navigation, as they can provide information about the depth of the water, the location of hazards, and the direction and strength of currents.
Most buoys are round or cylindrical in shape, with a diameter of 3-5 feet (0.9-1.5 meters). However, buoys can come in all shapes and sizes, depending on their purpose. For example, some buoys are designed to break apart in strong currents or waves, while others may be equipped with solar panels or other means of powering lights or electronic equipment.