The invasion by the water hyacinth and pollution threaten this lake shared by Burundi and Rwanda.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/burundi-lake-rweru-almost-dying-out
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/all-africa
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/burundi
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/freshwater-ecosystems
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa