It is also quite likely that their boundaries changed over time.

The district's boundaries did not change during its 30 years.

The boundaries of the department were vague, and changed over time.

Note: The boundaries of districts have sometimes changed over history.

The city's boundaries and designation changed several times in the 20th century.

The boundaries have changed since the last elections in 2007.

Consider how the boundaries of Europe have changed in the past hundred years.

The boundaries of the territory did not change during its existence.

During its history, boundaries often changed when owners bought or sold land.

The department's boundaries have not changed since the 19th Century when many of the areas it covers were rural.