One of the answers is 5. Floods Annually.
I have this on a test and its asking for 3 answers. I do not know the other two, but you only asked for one so...
~Hello there! ^_^
Your question: What name is given to the region where sea meets land?
Your answer: Intertidal zones is the name given to the region where sea meets the land.
Hope this helps~
That would be the Himalayas and have the highest mountain range in the world.