Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Virunga National Park' has mentioned 'The Bottom' in the following places:
Occurrence Sentence Text Source
The activity of Nyiragongo is of world importance as a witness to volcanism of a lava lake: the bottom of its crater is in fact filled by a lake of quasi permanent lava that empties periodically with catastrophic consequences for the local communities.