Disputes - international:
Tanzania still hosts more than a half-million refugees, more than any other African country, mainly from Burundi and the Democratic Republic of the Congo, despite the international community's efforts at repatriation; disputes with Malawi over the boundary in Lake Nyasa (Lake Malawi) and the meandering Songwe River remain dormant

Refugees and internally displaced persons:
refugees (country of origin): 352,640 (Burundi); 127,973 (Democratic Republic of the Congo) (2007)

Illicit drugs:
targeted by traffickers moving hashish, Afghan heroin, and South American cocaine transported down the East African coastline, through airports, or overland through Central Africa; Zanzibar likely used by traffickers for drug smuggling; traffickers in the past have recruited Tanzanian couriers to move drugs through Iran into East Asia.