Volcanic calderas that are partially or fully submerged under the water of a larger ocean or lake, sometimes forming a reef, bay or harbor.
Not to be confused with atolls, where a sunken seamount has grown a ring of coral islands surrounding a lagoon.
See also Category:Volcanic crater lakes, which are lakes that fill the craters of otherwise terrestrial volcanoes.
This category has the following 5 subcategories, out of 5 total.
The following 38 pages are in this category, out of 38 total. This list may not reflect recent changes.