Image: Great Blue Hole
Description: Great Blue Hole, Coast of Belize - a phenomenon of Karst topography.
Title: Great Blue Hole
Credit: Source: , fetched September 2006. Caption on this USGS web page was, "Blue Hole: Aerial view of the 400-ft-deep oceanic blue hole (Lighthouse Reef Atoll Blue Hole) located east of Belize."
Author: U.S. Geological Survey (USGS)
Permission: no need, public domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No