The catastrophic event in 1816 that led to global climate anomalies known as "The Year Without a Summer" was the eruption of Mount Tambora in Indonesia. This volcanic eruption, which occurred in April 1815, was one of the most powerful in recorded history, expelling vast amounts of ash and sulfur dioxide into the atmosphere. As a result, temperatures dropped significantly in 1816, leading to crop failures and food shortages in various parts of the world, particularly in North America and Europe. The year is marked by failed harvests, severe storms, and unusual weather patterns, impacting agriculture and economies, and leading to increased social unrest.