# The population density index - **The population density index (population per square kilometer of land area)** measures the number of people divided by the land area in square kilometers. - The graph shows the **population density rates** for **Monaco** and **Bahrain**, which are considered to have **high population densities**, over a decade from **2012 to 2021**. - **Monaco** has the **highest population density in the world** due to its **small land area and large population**.

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