The Mississippi River meanders roughly south from its headwaters in Lake Itasca, Minnesota, at longitude 95 degrees west, to its mouth on the Gulf of Mexico at longitude 89 degrees west. . For the greater part of its length, it is within a hundred miles of longitude 90 degrees west.
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The 90th meridian west forms a great circle with the 90th meridian east, located midway between the Prime meridian and the 180th meridian; thus, the center of the Western Hemisphere is on this meridian. In the United States, the Mississippi River runs close to the 90th meridian, crossing the meridian several times.
Tennessee borders the Mississippi River in the west and the Tennessee River in the east. It does not directly border any oceans but is part of the Mississippi River watershed that eventually flows into the Gulf of Mexico. There are also various lakes within Tennessee, including Kentucky Lake and Chickamauga Lake.
The Yangtze River in China has a river mouth that is very close to the 90 degrees E line of longitude. It empties into the East China Sea.
The international date line roughly follows the 180° longitude line in the Pacific Ocean. When you cross this line from west to east, you advance one day, and when you cross from east to west, you go back one day.
"Crossing the Line" is associated with crossing the equator at 0 degrees latitude, not longitude. If you cross the equator (0 degrees latitude) at 0 or 180 degrees longitude, there is an additional status included.
It is instantaneous. A longitude is an idealised line and so infinitesimally thin. To go from one longitude to the next takes approx 15 minutes.