Harmony's planet is a planet in the Pegasus galaxy that held a Stargate. The planet is a mountainous and heavily foliated world, which also contains wetlands.
History
The ruins of Larris.
The Lanteans formed an outpost on a location that the current people dub the "Ruined temple of Larris". The Lanteans built the outposts in order to develop a miniature version of their infamous drone weapons.
In present times, the planet is occupied by a race of primitive Humans who live under monarchial rule. The Atlantis expedition visits the planet on occasion to establish trade, and warning the simple people of an impending Wraith culling. Thanks to the warning the planet's natives were able to hide until the Wraith left, with no loss of lives. (SGA: "Harmony")