Ethiopia's Lake Tana threatened by alien weed invasion

Ethiopia's largest lake, Lake Tana, is being lost to an invasive South American weed, the water hyacinth.

The BBC has launched its new radio services aimed at Ethiopia and Eritrea in the Amharic, Afaan Oromo and Tigrinya languages.

Video journalists: Kalkidan Yibeltal, Wegene Alemayehu, Yadeta Berhanu and Charlie Northcott.