The image depicts a diagram of a lock system, which is a type of waterway that allows ships to pass through a series of locks and dams. The diagram shows two main components: the ocean and the lake. 

1. **Ocean**: The ocean is depicted as a large body of water with waves and a horizon line.
2. **Lake**: The lake is shown with a dam or lock structure in the middle, separating it from the ocean.

The lock system consists of a series of vertical pipes or gates that allow ships to pass through. The lock system is used to control the flow of water and to ensure that ships can navigate through the waterway safely and efficiently. The lock system is essential for maritime transportation, especially in areas where there are no natural waterways.