1. Geological evidence: The presence of salt deposits and gypsum in the Mediterranean Sea basin indicates that the sea was once a shallow body of water that evaporated, leaving behind these mineral deposits.
2. Paleontological evidence: The discovery of fossils of marine organisms, such as sea shells, corals, and fish, in the mountains surrounding the Mediterranean Sea basin provides evidence that the sea once covered these areas.
3. Historical evidence: Ancient texts, such as the writings of Greek and Roman historians, describe the Mediterranean Sea as a much smaller body of water during certain periods of time, suggesting that it had experienced significant fluctuations in water level.
4. Oceanographic evidence: Studies of the Mediterranean Sea's water circulation patterns and salinity levels indicate that the sea has a unique and distinctive hydrological regime, which is thought to be a result of its history of drying up and refilling.
5. Speleological evidence: The existence of underwater caves and tunnels in the Mediterranean Sea basin, which are believed to have been formed when the sea level was much lower, provides additional evidence that the sea has experienced periods of desiccation.