best islands to visit

the island is a piece of land or land that is smaller than continental and larger area of the reef, which is surrounded some island named islands.
there are four requirements that must be fulfilled in order to be referred to as the island:
landless mainland
formed naturally, instead of reclaimed land
surrounded by water, either salt water (sea) and fresh
always be above the high tide line \
The beach is a geographical form that consists of sand, and there is a sea in coastal areas. The beach area became the boundary between land and sea. The measured length of coastline surrounding the entire beach is a territorial area of a country.
Coastline is meeting boundary between sea and land parts in the event of the highest tides. Sea lines may change due to abrasion, namely the erosion of beaches by blow sea waves cause a reduction in land area.
There are several important steps that can be done in securing the coastline such as breakwaters and development of vegetation on the beach.
To overcome abrasion / scouring the shoreline from waves / surf can be used breakwater which serves to reflect the wave energy back. Various ways in which to solve them by using the waves pile made of concrete tetrapods at a certain distance from the shoreline.
Mangrove forests can help overcome the wave as well as well as beneficial to animal life as well as a breeding ground for certain fishes. Mangrove forests in most of the North coast has been lost because of human activity, which in turn will erode the beach
Coral reefs are also a natural breakwater, so it needs to be preserved and developed in defense of the coastline.