Disputes - international:

Botswana built electric fences and South Africa has placed military along the border to stem the flow of thousands of Zimbabweans fleeing to find work and escape political persecution; Namibia has supported, and in 2004 Zimbabwe dropped objections to, plans between Botswana and Zambia to build a bridge over the Zambezi River, thereby de facto recognizing a short, but not clearly delimited, Botswana-Zambia boundary in the river

Refugees and internally displaced persons:

refugees (country of origin): 6,536 (Democratic Republic of Congo)
IDPs: 569,685 (MUGABE-led political violence, human rights violations, land reform, and economic collapse) (2006)

Illicit drugs:

transit point for cannabis and South Asian heroin, mandrax, and methamphetamines en route to South Africa