The image is a diagram illustrating the concept of a lock system in a lake. The diagram shows three main components: the ocean, a lake (Gatun Lake), and a lock. 

1. **Ocean**: The topmost part of the diagram represents the ocean, which is depicted as a large body of water.
2. **Lake (Gatun Lake)**: The middle section of the diagram shows the lake, which is labeled as "Gatun Lake." It appears to be a rectangular shape with a clear boundary.
3. **Lock**: The bottom part of the diagram depicts the lock system. A boat is shown entering the lock, indicating that it is a man-made structure designed to control water flow.

The lock system is crucial for navigation, as it allows boats to pass through it, ensuring that water levels remain consistent and preventing flooding or overflows. The lock system also plays a role in regulating water levels in the lake, ensuring that the lake's water level remains within