What makes Spa F1's track so notoriously dangerous?

Spa-Francorchamps is considered dangerous primarily because of its high-speed corners, dramatic elevation changes, and unpredictable weather. The most notorious section is Eau Rouge and Raidillon, a blind uphill chicane taken at near-full throttle where any mistake at high speed leaves little room for recovery. The track's length and varied topography mean weather conditions can differ dramatically from one sector to another, with drivers encountering dry tarmac in one section and heavy rain in another with little warning. The Kemmel Straight that follows Raidillon sees cars reach extremely high speeds, making any mechanical failure or contact particularly consequential. The combination of fast corners with limited runoff in certain areas, plus the weather variability, has contributed to several fatal accidents throughout its history.