What's the name of the classic children's book where the boy goes exploring and marks the land with red flags?

I remember this book from my childhood but can't remember the name. It's a picturebook.

What's the name of the classic children's book where the boy goes exploring and marks the land with red flags?
This right.





http://www.amazon.com/Roxaboxen-Alice-Mc...
Reply:Is it Roxaboxen by Cooney?

broadleaf