There are over 100,000 inhabited islands throughout the world.
It is impossible to calculate the exact the amount of islands in the world because new islands emerge and submerge all the time. Currently there are about 2 million islands in the world altogether. That's really a lot!
An island is any piece of sub-continental land that is surrounded by water.
You get oceanic and sub-continental islands.
An island in a river or lake is called an eyot. It can also be called a holm.
Sometimes an island is joined to another island or mainland by a causeway or land bridge but its still called an island.
Groups of islands are called archipelagos.
Crannogs were small man-made islands in Irish and Scottish lochs.
Most crannogs were in use from the Iron Age to the early Medieval times. There is even a crannog in Scotland (Outer Hebrides - Uist) that dates back to the Neolithic Age (3200 -2800BC).
Crannogs were often areas of defence. The word dun means fort in Gaelic. Many crannogs had a dun or broch tower. The crannogs were reached by stepping stones or a stone/wooden bridge. They were also reached by boat.
The crannogs and eyots often had trees and bushes on them as they were protected from grazing animals.
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