With many important tributaries like Missouri, Arkansas, Ohio, Kansas river.

Mississippi is the biggest and the longest river.

Rio Grande flows through the american-mexician border. In western part the well known rivers are: Columbia, Sacramento, Colorado with its famous Colorado Canyon.

The greatest and the largest lakes are Great Lakes: Ontario, Erie, Huron, Michigan, Superior.

Natural Resources:

The U.S. is rich in mineral resources, especially oil, zinc, copper, lead, silver and gold, aluminium, coal and iron.

Climate:

The U.S. as a whole has a good conditions. This block of 48 states is temporate zone. Extreme south has subtropical climate. The Atlantic coast is relatively cold with heavy snowfalls in winter. Summers are hot and very humid. The Middle west einters are colder and longer while summers are hot and dry. The gulf coast has mild climate with good rainfall. This western mountainous part has long and cold winters with heavy snowfalls. Summers are very hot. There are some deserts and very dry plateans in Arizona, Nevada and New Mexico. The Pacific coast has a milder climate then the Atlantic one, owing to mild winds flowing from the Pacific.

Population:

The population of the U.S.A is about 253 million. Approximately 2/3 of inhabitants live in the urban areas. About 14% of the population are clasified as non-white. The american indians account only about 0.3% of population.

The largest cities, ports:

The largest cities with population over 2 million are: New York, Los Angeles, Chicago, Philadelphia, San Francisco, Detroit, Boston, Washington D.C., Houston, Dallas etc.

The largest ports on the Atlantic coast are: New York, Boston, New Port.

The most important inland ports: Chicago, Detroit, Kansas City.

The largest port in Gulf of Mexico is New Orleans.

The most important port on Pacific coast is Los Angeles, San Francisco, Long Beach.