Here are three sentences with just a word's difference between each one.
What do they tell us about the speaker and their location?
1. I've never been to the beach.
2. I've never been to that beach.
3. I've never been to this beach.
The ideas behind the sentences are quite different simply because of the difference between "the" ,"that" ,and "this" in front of the noun. Let's find out why!
I've never been to the beach = I've never gone to any beach, anywhere.
The is a tricky article. As a definite article, it usually tells us about a topic that's already mentioned or a noun there is only one of. For example:
A: Here's a paper and pencil you can use.
B: Thanks! I'll give the pencil back to you later.
With certain place nouns, though, "the" means "any/all of this kind of place." It usually talks about a certain kind of environment. Beach is one - when we say "the beach," we mean any beach. Others like this include the ocean/the countryside/the city/the desert/the woods/the water (enough water to swim in). If there are other nouns we think of as one big idea, like the rain or the people, they'll also have this kind of "any/all" meaning behind them when said this way.
Ex: The president should listen to the will of the people.