Mexico
abundant rainfall in recent years along much of the Mexico-US
border region has ameliorated periodically strained water-sharing
arrangements; the US has intensified security measures to monitor
and control legal and illegal personnel, transport, and commodities
across its border with Mexico; Mexico must deal with thousands of
impoverished Guatemalans and other Central Americans who cross the
porous border looking for work in Mexico and the United States
Micronesia, Federated States of
none
Moldova
Moldova and Ukraine operate joint customs posts to monitor
the transit of people and commodities through Moldova's break-away
Transnistria region, which remains under OSCE supervision
Monaco
none
Mongolia
none
Montenegro
none
Montserrat
none
Morocco
claims and administers Western Sahara whose sovereignty
remains unresolved - UN-administered cease-fire has remained in
effect since September 1991, but attempts to hold a referendum have
failed and parties thus far have rejected all brokered proposals;
Morocco protests Spain's control over the coastal enclaves of Ceuta,
Melilla, and Penon de Velez de la Gomera, the islands of Penon de
Alhucemas and Islas Chafarinas, and surrounding waters; discussions
have not progressed on a comprehensive maritime delimitation,
setting limits on resource exploration and refugee interdiction,
since Morocco's 2002 rejection of Spain's unilateral designation of
a median line from the Canary Islands; Morocco serves as one of the
primary launching areas of illegal migration into Spain from North
Africa
Mozambique
none
Namibia
concerns from international experts and local populations
over the Okavango Delta ecology in Botswana and human displacement
scuttled Namibian plans to construct a hydroelectric dam on Popa
Falls along the Angola-Namibia border; managed dispute with South
Africa over the location of the boundary in the Orange River;
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