Which of the following map scales is the largest?

The map scale indicates the relationship between distances on the map and distances in real life. A larger scale means that the map represents a smaller area with greater detail. In this context, a scale of 1:25,000 means that 1 unit of measurement on the map corresponds to 25,000 of the same units in reality.

Conversely, a scale of 1:100,000 indicates that 1 unit on the map corresponds to 100,000 units in reality, which covers a larger area with less detail. Similarly, 1:1,000,000 covers an even larger area, with significantly less detail. A scale of 1:10,000 is also larger than the other options except for 1:25,000, as it represents a smaller area proportionately.

Thus, 1:25,000 is the largest scale among the options provided, meaning it offers the most detailed view of a given area, making it the correct choice.