- "Planet Leera was ninety-two percent covered by water. Eight percent land in a few scattered islands and one continent. The land battle would take place on the continent. Neither we nor the Yeerks had much capability underwater where the Leerans built their cities. I could see several Leeran cities, usually built within forty or fifty miles of the continent or one of the islands. [...] Most of it was lush and green, primarily jungle. Green like Earth's forests and jungles, but with wide swaths of some brilliant yellow vegetation, too. The northern end of the continent was less fertile, more barren, probably colder."
Leera is the home planet of the Leerans and is ninety-two percent water. The Leerans make their homes underwater in huge lavish cities, but can use the land to lay their eggs as well as to commerce with other races. The oceans of Leera are as clear as air, allowing one to see for miles, and has a huge variety of underwater life. The Leeran continent was destroyed by the Animorphs to thwart the Yeerk invasion of the planet after the Andalites faked a major loss so that the Yeerks would deploy their forces en masse, as Leeran technology had advanced to the point where they no longer needed the continent to survive.
- The Escape (mentioned only; referred to as "Leeran")
- The Decision
- Elfangor's Secret (mentioned)
- The Arrival (mentioned)
- The Test (mentioned)