Hello,
1- In case this info is helpful, I pasted below the specs of these "islandscapes" from the WalMart web site including size (the link appears below Walmart's picture of an islandscape - if this link is changed in the future, just search using the key word "islandscape" - singular - on the Walmart web site).

2- Jennifer posted on this site last June 23, providing the link to Walmart's islandscapes. She wrote that she uses the islandscapes and she added her email address to her post (click on "Show E-Mail" to get her email address) - See http://www.stanley-park-swans.com/cgi-bin/ask/index.pl?read=2396 (copy and paste this link into your browser if it is not clickable)

From Walmart's web site:

"Buy your own private island! Islandscapes living floating gardens enhance the beauty and biological health of ponds and waterways - providing innovative filtration and a lush growing environment for terrestrial plants. Islandscapes provide food and fun for fish, frogs and wildlife.

Islandscape Living Floating Garden :

Grow all kinds of flowers
Plant herbs, terrestrial flowers, grass - even shrubs
No need to water plants
Open weave matrix promotes growth all the way to water line
Creates cover and habitat for fish, frogs and birds
A natural way to achieve clearer water
Acts as a floating bio-filter for your pond
Provides biological benefit for ponds up to 2,500 gallons
Comes with a tether ring for easy anchor attachment
Proprietary planting mix wicks moisture up to 7"
Step-by-step planting instructions
Connect together to form larger islands or island archipelagos
Made from 97% recycled post consumer polyester
5-year limited manufacturer's warranty
40.5" W x 31" L x 5.5" H
Model: IP200
In cooperation with the National Wildlife Federation™
Handcrafted in USA
Shipping Weight (in pounds): 25.5
Product in Inches (L x W x H): 40.5 x 31.0 x 5.6
Assembled in Country of Origin: USA and/or Imported
Origin of Components: USA and/or Imported
Wal-Mart No.: 001676168 "