Help with grammar needed for presentation
 

Hi,
I'm currently working on a presentation for Japanese class that needs me to talk about the Tohoku region and advertise/promote it. Just need some help on how to say some things, im still working on the script so i may have more questions to ask later on:

(1) Just needed to know, i want to say "Tohoku is approximately 67000 square kilometers, and is about 17% of japan". Would i go: "Tohoku wa 67000 heihou kirometoru gurai de, nihon no 18 pasento gurai desu"? Sorry it's in romaji, not on my PC atm so can't type in Jap :p

Appreciate all the help, thank you very much in advance!

"Tohoku wa 67000 heihou kirometoru gurai de, nihon no 18 pasento gurai desu"

It is correct in grammar. But you seem to aim more higher level.

東北地方の面積は67,000平方キロメートルで、日本全体の 17%にあたります。

I prefer to divide it into two senses.

東北地方の面積は67,000平方キロメートルです。これは日 本全体の17%にあたります。