Coastal regions are generally found along the outsides of continents that have oceans around them.
Wherever there is water and a hydroelectricity plant. It can be found in most coastal regions and at most resorivers and rivers/ lakes.
Phragmites can be found in swamps and marshes throughout temperate and tropical regions of the world.
Tundra
The north pole and south
In general a body of water with the word "sea" in its name probably contains salt water, but it's not an ironclad guarantee. For example, the Sea of Galilee is fresh water.
Triopcal reinfoest
Elemental sulfur can be found near hot springs and volcanic regions regions in many parts of the world, especially along the pacific ring of fire
Whales are found in all of the major oceans in the world. Different species of whales are found in different regions of the world.
Some hawk species are found in most regions of the world, exception being Antarctica.
Crocodiles are found in rivers and swamps around the world, in trpoical regions.
A complete list of the different regions of the world can be found at a website called Nations Online. The list is written in alphabetical order to aid in easier search.