Mauritania
Mauritanian claims to Western Sahara remain dormant
Mauritius
Mauritius claims the Chagos Archipelago (UK-administered
British Indian Ocean Territory), and its former inhabitants, who
reside chiefly in Mauritius; claims French-administered Tromelin
Island
Mayotte
claimed by Comoros
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
Midway Islands
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