Located near 30 degrees north latitude and 195 degrees west longitude on Mercury, there is a massive geological feature known as the Caloris Basin. With a diameter of approximately 1,300 kilometers, it is surrounded by mountains that rise up to 2 kilometers high. Whenever the Mariner 10 spacecraft flies over this region, Mercury is at its perihelion, causing sunlight to directly hit the center of the basin and resulting in a sharp increase in temperature, making it the hottest place in the solar system. This basin is thus named 'Caloris Basin,' with 'Caloris' meaning 'heat' in Latin. Although it resembles the 'maria' found on the Moon, it is actually a high-temperature hotspot shrouded in mystery.