Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Defence Line of Amsterdam' has mentioned 'Fortification' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| Built between 1883 and 1920, the ring consists of an ingenious network of 45 forts, acting in concert with an intricate system of dikes, sluices, canals and inundation polders, and is a major example of a fortification based on the principle of temporary flooding of the land. | UNESCO |