This page will help you find where each of these places are in the world.
Cairns is situated in north east Queensland, on the coast of Australia.
Phuket is an island found in the south of Thailand.
Berlin is the capital of Germany and located in the north east of the country.
As you can see from the descriptions and these maps, Cairns and Phuket are coastal, whereas Berlin is land-locked (surrounded by land). Berlin still has beaches, but they are on lakes, the Wannsee and Schlachtensee.