Read the following text and answer the question!

My classroom is very big. There are twenty classrooms and forty chairs for students. The teacher's table is in front of the classroom. The teacher sit behind the table. Behind her is the whiteboard. Beside the whiteboard is a map of Indonesian archipelago. Under the map, there is a bookshelf. There are two windows in the room. Between the windows is a picture of Prambanan temple. I like my classroom very much.

What is the synonym of "big"?