Somalia also well established, with many local "jama'a" ("zawiya") or congregations of the various "tariiqa" or Sufi orders. The constitution of Somalia likewise defines Islam as the state religion of the Federal Republic of Somalia, and Islamic sharia as the basic source for national legislation. It also stipulates that no law that is inconsistent with the basic tenets of Shari'a can be enacted. Islam entered the region very early on, as a group of persecuted Muslims had sought refuge across the Red Sea in the Horn of Africa at the urging of the Islamic prophet Muhammad. Islam may thus have been
Geography of Somalia the northeast, "Boswellia" and "Commiphora" trees are sources, respectively, of the frankincense and myrrh for which Somalia has been known since ancient times. A broad plateau encompassing the northern city of Hargeysa, which receives comparatively heavy rainfall, is covered naturally by woodland (much of which has been degraded by overgrazing) and in places by extensive grasslands. Parts of this area have been under cultivation since the 1930s, producing sorghum and maize; in the 1990s it constituted the only significant region of sedentary cultivation outside southwestern Somalia. The Haud south of Hargeysa is covered mostly by a semiarid woodland of scattered