they vary from the largest which is two and a half kilometres long

[anhnha]

Let's move on to the beaches here which are absolutely beautiful. You do have over a hundred to choose from, they're mostly sandy beaches and they vary from the largest which is two and a half kilometres long, to tiny sandy coves.

Is "long" in the sentence above an adjective or adverb?
Can I rewrite the sentence as follows?
1.You do have over a hundred to choose from, they're mostly sandy beaches and they vary from the largest which is two and a half kilometres in length, to tiny sandy coves.
2.You do have over a hundred to choose from, they're mostly sandy beaches and they vary from the largest which is two and a half kilometre length, to tiny sandy coves.

[emsr2d2]

1 - Yes
2 - No

[anhnha]

Thanks, and why I can't consider "two and a half kilometre" in " two and a half kilometre length" is an adjective that refer to the noun "length"?
What is role of "long" in the original sentence? Is it an adjective or adverb?

[SoothingDave]

It's an adjective. The beach is long.

[anhnha]

Thank you!
Can I ask another question?
What is role of "two and a half kilometres" in the following sentence?
The beach is two and a half kilometres long.
I think it may be an adverb or a noun.

[anhnha]

What is role of "two and a half kilometres" in the following sentence?
The beach is two and a half kilometres long.
I think it may be an adverb or a noun.

Can anyone help? I need to understand the structure. Now I think it probably has the full sentence like this:
The beach is two and a half kilometres long(beach).

[Odessa Dawn]

***NOT A TEACHER***

Happy New Year!

He give many rules that clear most of my doubts for a long time.

Now I think it probably have the full sentence like this:
The beach is two and a half kilometres long(beach).

Will you, anhnha, check the above statements, please?

Thank you,

[anhnha]

Thank you, OD and Happy New Year!
1. He gives many rules that clear most of my doubts for a long time.
2. Now I think that it probably has the full sentence like this:
The beach is two and a half kilometres long (beach).
Thank you for pointing that out. I have to pay more attention now; I really don't recognise these mistakes. Maybe, it is becoming similar to me.

[Rover_KE]

What is role of "two and a half kilometres" in the following sentence?
The beach is two and a half kilometres long.

It is an adjectival phrase.

Rover