Rivers,Waterfalls and Lakes

The source of the Nile was discovered by Europeans in 1858 when British explorer John Hanning Speke reached Lake Victoria Nyanza, in what is now Burundi. Almost a hundreds year later , in 1953, the source of the Amazon was identified as a stream called Huarco flowing from the Misuie.But geographers do not consider the entire route to be part of the Amazon basin, so the Nile, with an overall length of 6695 km, is considered the world,s longest river.

Geysers

Geysers are jets of boiling water and steam that erupt from beneath the ground where water is heated by volcanic activity. The name geysers comes from a hot spring called Geysir at Haukadalur ,Iceland. Yellowstone National Park,Wyoming, USA has more geysers than anywhere else. There are 500 active ones including Steamboat geyser, which erupts to a height of 120m and old faithful geyser which erupts about every 91 minute.

Largest Islands

The largest island in the world is Greenland.An a island is a piece of land surrounded by water. Australia is so large it is continent, not a island; otherwise it would rank first. The largest US island is Hawaii, which measures 10.456sqkm, and the largest off mainland USA is Kodiak,Alaska, at 9.510sqkm. The smallest island with country status is Pitcairn, at just4.53sqkm.