The mirror measures approx. 9" x 9" along the longest edges.
The suggested way to affix to your wall is with 3M Command Strips, which are safe for most wall covers (including paint).
You can find a similar mirror here, with bodies of water engraved away: http://www.etsy.com/listing/91065529/district-of-columbia-mirror-with-water
See more of my products here: http://www.etsy.com/shop/PlainlyStated