LOVE this song, here's my version of the chords, basically nicked from the acoustic tab 
its clearer.
The bit after the chorus "cause you tear us apart" that little section there is a bit 
with the chords but i can't for the life of me figure it out so i just put down my best 
Other than that id say its pretty accurate, rateeee!

TUNING: EADGBE

D5: |xx0230|
D5/A|xx0235|
D5/F#m|040235|
Bm|224432|
G|320003| or |355433| or (my favourite) |055430|
A|00222x| or |577655| or (my favourite) |077650|


Bm                                     G
I took a bite out of a mountain range, thought my teeth would break the mountain down.
Bm                      G
Lets go, I want to go, all the way to the horizon.

Bm                                   G
I took a drink out of the ocean and I'm treading water there before I drown.
Bm                          G
Lets dive, I want to dive, to the bottom of the ocean.
A                             Bm
I took a ride, I took a ride, I wouldn't go there without you.
A                                    Bm
Lets take a ride, we'll take a ride. I wouldn't leave here without you.

D5               D5/A          D5/F#m
I am a mountain, I am the sea, you can't take that away from me.
I am a mountain, I am the sea, you can't take that away from me.

(when they play this live he plays a riff roughly based around the A chord, so either 
at other tabs or use your imagination for this bit)
'Cause you tear us apart, with all the things you don't like.
You can't understand that I won't leave 'til we're finished here, and then you'll find 
where it all went wrong.

Bm                                G
I wrote a note to the jungle and it wrote me back that I was never crowned,
Bm                       G
  king of the jungle, so there's and end to my horizon.
A                               Bm
I took a ride, I took a ride. I wouldn't go there without you.
A                                    Bm
Lets take a ride, we'll take a ride. I wouldn't leave here without you.

D5               D5/A          D5/F#m
I am a mountain, I am the sea, you can't take that away from me.
I am a mountain, I am the sea.

(A chord fiff)
'Cause you tear us apart, with all the things you don't like.
You can't understand that I won't leave 'til we're finished here, and then you'll find 
where it all went wrong.

Bm                     G                   A                  
  Bm
Nothing lasts forever, except you and me. (You are my mountain, you are my sea)
Bm                      G                   A                 
  Bm
Love will last forever, between you and me.(You are my mountain, you are my sea)

D5               D5/A          D5/F#m
I am a mountain, I am the sea, you can't take that away from me.
I am a mountain, I am the sea.
I am a mountain, I am the sea