Negatives on the Number Line — Visualization & Examples

Sea level is the average level of the surface of the Earth's oceans; it is often used as a zero point for the relative comparison of various elevations. While different land formations are typically above sea level (for example, the peak of Mt. Everest is $8{,}848$ meters above sea level), some are actually below sea level without being underwater! $$\\$$ The city of New Orleans in Louisiana is $7$ meters below sea level. The base of Death Valley is $85$ meters below sea level. Salton Sink, also in California, is a natural sink at $66$ meters below sea level. $$\\$$ Which of these three areas has the lowest elevation?