he smallest and most remote countries on Earth; six
of the coral atolls - Nanumea, Nui, Vaitupu, Nukufetau, Funafuti,
and Nukulaelae - have lagoons open to the ocean; Nanumaya and Niutao
have landlocked lagoons; Niulakita does not have a lagoon

Uganda
landlocked; fertile, well-watered country with many lakes and
rivers

Ukraine
strategic position at the crossroads between Europe and
Asia; second-largest country in Europe

United Arab Emirates
strategic location along southern approaches to
Strait of Hormuz, a vital transit point for world crude oil

United Kingdom
lies near vital North Atlantic sea lanes; only 35 km
from France and linked by tunnel under the English Channel; because
of heavily indented coastline, no location is more than 125 km from
tidal waters

United States
world's third-largest country by size (after Russia
and Canada) and by population (after China and India); Mt. McKinley
is highest point in North America and Death Valley the lowest point
on the continent

United States Pacific Island Wildlife Refuges
Baker, Howland, and
Jarvis Islands: scattered vegetation consisting of grasses,
prostrate vines, and low growing shrubs; primarily a nesting,
roosting, and foraging habitat for seabirds, shorebirds, and marine
wildlife
Johnston Atoll: Johnston Island and Sand Island are natural islands,
which have been expanded by coral dredging; North Island (Akau) and
East Island (Hikina) are manmade islands formed from coral dredging;
the egg-shaped reef is 34 km in circumference
Kingman Reef: barren coral atoll with deep interior lagoon; closed
to the public
Midway Islands: a coral atoll managed as a national wildlife refuge
and open to the public for wildlife-related recreation in the form
of wildlife observation and photography
Palmyra Atoll: the high rainfall and resulting lush vegetation make
the environment of this atoll unique among the US Pacific Island
territories; it supports one of the largest remaining undisturbed
stands of Pisonia beach forest in the Pacific

Uruguay
second-smallest South American country (after Suriname);
most of the low-lying landscape (three-quarters of the country) is
grassland, ideal for cattle and sheep raising

Uzbekistan
along with Liechtenstein, one of the only two doubly
landlocked countries in the world

Vanuatu
a Y-shaped chain of four main islands and 80 smaller
isl