How many countries were affected by the 2004 Indian Ocean Tsunami?

The 2004 Indian Ocean Tsunami had a significant impact on multiple countries surrounding the Indian Ocean. Following the undersea earthquake that triggered the tsunami, various nations experienced devastating effects. The countries most severely affected included Indonesia, Thailand, Sri Lanka, India, and several others.

In total, the tsunami impacted 14 countries. This includes countries along the coasts of the Indian Ocean, where the tsunami caused either flooding, destruction, or casualties. While some other options suggest lower or higher numbers, 14 accurately reflects the total count of nations that suffered from the tsunami's effects, highlighting the widespread devastation that natural disasters can cause across multiple regions.