In which of the layers indicated by the numbers 1-4 in the figure are artesian waters contained? Write the corresponding number in the answer.

• The figure shows different layers of soil and water.
• Layer 1 appears to be surface water or groundwater close to the surface.
• Layer 2 shows a confined aquifer, which is characteristic of artesian systems.
• Layer 3 shows another layer, possibly impermeable.
• Layer 4 shows a deeper aquifer, which could also contain artesian water.
• However, the typical representation of artesian water in diagrams like this usually refers to a confined aquifer where water is under pressure. Layer 2 fits this description best as it is situated between two less permeable layers.

Answer: 2