The USA offers a big diversity of diving, from the ice-cold artic waters to the Pacific ocean and Atlantic coast, as well as the beautiful Caribbean Sea and thousands of fresh water lakes. Amongst the best diving spots are: the Molokini Crater in Maui, Hawaii, an island made up by a volcanic crater, ideal for recreational dives, where you can see rays; the USS Oriskany shipwreck, a former aircraft carrier sunk to be an artificial reef in Pensacola, Florida; the U-352, a 1942 German boat, about 110 meters deep in Crystal Coast, North Carolina; the Blue Grotto, the biggest cave in Florida up to 30 meters deep. In the USA adventure is endless, where you can dive in caves, shipwrecks, reefs and lakes, besides the great diversity of marine species.
The contiguous United States is approximately 7 761 475 km². Alaska, separate from the contiguous US by Canada, is its biggest state, with 1.5 million km². Hawaii, occupying an archipelago in the central Pacific, southwest of North America, has just over 16 000 km². The United States is the third or fourth biggest nation in the world in total area (land and water), after Russia and Canada, and before or after China. Due to its great geographical extension and variety, the US has most types of climate. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south. The southern tip of Florida is tropical, as is Hawaii. The Great Plains west of the 100th meridian are semi-arid. Much of the Western mountains are alpine. The climate is arid in the Great Basin, desert in the Southwest, Mediterranean in coastal California, and oceanic in coastal Oregon and Washington and southern Alaska. Most of Alaska is subarctic or polar.
Most of the Canadian citizens and many citizens from countries in the Visa Waiver Program can travel to the US without a visa, as long as they can meet a few requirements. Travellers entering the U.S. through the Visa Waiver program must now apply for Electronic System for Travel Authorization (ESTA). Visitors of countries not in the Visa Waiver Program will need a visa from the American Consulate for a stay up to 90 days.
There are occasional outbreaks of mosquito-transmitted diseases in the US, like the West Nile virus, Eastern equine encephalitis (EEE) and dengue fever. You must take precautions against mosquito bites whenever possible and seek medical attention as soon as you feel indisposed. For more informations, please consult you doctor.
The United States has seven time zones, from UTC -4 to UTC -10.
As for communications, the US has a modern telecommunications network, like public phones that you can find in all the main city centers, cellphones of the T-Mobile USA and AT&T networks. You can acquire a prepaid card or use your cellphone through your country's roaming service. You can also access the internet, available in cybercafés, bars, hotels and libraries.
In the US, electricity is 120 volts by 60 Hz. The plugs and sockets are the USA type, with two flat pins.
Tipping in America is widely used and expected particularly to people in the service/hospitality industry (staff in restaurants, taxis, hotels).
Which are the best scuba diving locations in United States? Below, you will find a list of all locations of United States, organized by regions, in which you can dive and snorkel.
Which locations in United States have underwater photos? Below, you will find the list of locations from United States and for each location a list of underwater photos.
Which marine species can I observe in United States? Below, you will find the list of marine species and the photos for each species.
Which photographers have taken underwater photos in United States? Below, you will find the list of underwater photographers and their photos in United States.
Which liveaboard can I dive with in United States? Below, you can see the list of liveaboard in United States. Click on “more info” to find out more about each liveaboard.
Which accommodation can I rest after my dive in United States? Below, you can see the list of accommodation in United States. Click on “more info” to find out more about each accommodation.