A more thorough explanation:

labina (lə-BEE-nə), n. Archaic. Land covered by water; swampland.

• The area used to be a labina before it was drained and turned into farmland.
• The labina was home to many different species of birds and insects.

The examples illustrate that labina refers to land that is covered by water, such as a swamp or marsh. The first example shows how labina can be transformed into farmland by draining the water, while the second example highlights the diverse ecosystem that can exist in a labina.