Forests cover 12% of Somalia's land area, but only 4% of the land has dense tree stands. Somalia is one of the few areas in the world where frankincense is produced; incense trees of the genus Boswellia are found in the northeast. Gum arabic in small quantities is also produced. In the scant forests along the rivers of the Jubba region, Euphorbia ruspoli is milled and used for the production of banana crates. Roundwood production was estimated at 9,338,000 cu m (329.6 million cu ft), with almost 99% of it burned as fuel.