Which region of the brain surrounds the third ventricle?

Explanation

To answer the question "Which region of the brain surrounds the third ventricle?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ventricles of the Brain**:
- The brain contains several cavities known as ventricles that are filled with cerebrospinal fluid. The main ventricles include the lateral ventricles, third ventricle, and fourth ventricle.

2. **Locate the Third Ventricle**:
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