The answer is: The rivers and fountains of waters became blood

Rev 16 vs 4

In Revelation 16:4, we see one of the vivid images describing the third vial of wrath—rivers and springs turning to blood. This dramatic transformation echoes the biblical plagues of Egypt, where the Nile River turned to blood—symbolizing judgment and destruction, reminiscent of unintended consequences of wrongdoing.

The significance runs deep! Water, often representing life and purity in scripture, becoming blood drives home a poignant reminder of justice in ultimate disregard for righteousness. During these apocalyptic scenes, John uses grand symbolism, allowing readers through the ages to grasp the gravity of these judgments.

Now, let’s shine a light on some trivia. Did you know that water represented one of the most vital essentials in ancient societies? Saving and providing clean water was foundational to any community’s survival. The transformation to blood could symbolize the gruesome loss of life, forced ignorance of mankind towards environmental respect or wrongful bloodshed.

Other biblical accounts echo themes of transformation, with water becoming wine at the wedding in Cana, attesting that change often mirrors a deeper significance. Blood, a symbol of sacrifice, means life but also indicates severe consequences when misused. This flavorful storytelling invites reflection on our relationship with life-supporting elements, challenging readers on ethical stewardship.

Thus, Revelation's poetic propensity reveals something beyond mere wrath; it offers a canvas contemplating justice, a call for responsible behavior, and acknowledging the critical partnership we share with God's creation.