Explanation:

The Tigris River in Western Asia is known as the "River of Blood" due to its historical association with numerous battles and conflicts that have occurred in the region throughout history. The Tigris River flows through modern-day Iraq, originating in the Taurus Mountains of Turkey and merging with the Euphrates River to form the Shatt al-Arab waterway, which empties into the Persian Gulf. The Tigris River Basin was once the heartland of ancient Mesopotamian civilizations, including the Assyrian and Babylonian empires, where significant military campaigns and conquests took place. The river's strategic importance and its role as a witness to centuries of warfare have earned it the grim nickname "River of Blood."