There are multiple factors that can cause a normally pink tongue to turn red. In some instances, the tongue may even take on the appearance of a strawberry with enlarged, red taste buds dotting the surface. Possible causes include: Vitamin deficiencies. Deficiencies of folic acid and vitamin B-12 may cause your tongue to take on a reddish appearance. Geographic tongue. This condition, also known as benign migratory glossitis, is named for the map-like pattern of reddish spots that develop on the surface of the tongue. At times, these patches have a white border around them, and their location on the tongue may shift over time.
Mammoth Cave, the world's longest known cave system. The following is a list of the world's 10 longest caves per length of documented passageways. Many passageways are still being discovered; this list is based on the latest verifiable data.
Crater Lake is the deepest lake in the United States, with a maximum depth of 549 meters (1,949 ft).