The Dasha region or Dasha system is a region of space located in the periphery of Galactic Federation space.  The region houses the rogue planet Aether, where the events of Metroid Prime 2: Echoes take place.
Despite being a rogue planet, Aether is mentioned being a part of the "Dasha System" in the Space Pirate Logs  as well as in the logs left by GFMC Task Force Herakles.  It is unclear whether this is a mistake in the game's script or not. The game offers no further evidence of a planetary system and also refers to Aether as a rogue planet.. Rogue planets are planets located outside solar systems.
- "Science teams have discovered the presence of Phazon in the Dasha system four cycles ago. High command authorized the deployment of our team shortly thereafter. Our orders are to establish a base on planet Aether and evaluate local Phazon resources. Because this world lies on the periphery of Galactic Federation territory, we are following stealth protocols at the highest level. A cadre of elite commandos has been dispatched to provide security for our force as well. This operation is now under way." —Space Pirate Logs: Log 04.468.1 (Metroid Prime 2: Echoes)
- "Datecycle 07.014.2 (Cosmos) Final report, GFMC Task Force Herakles. Exeter, A.C. commanding. While on patrol in the Dasha system, we engaged an unknown Space Pirate frigate. The enemy frigate was crippled, and it crashed on the planet Aether. We followed the Pirates, but our ship was damaged by a storm as we entered Aether's atmosphere." —Captain A. Exeter (Metroid Prime 2: Echoes)
- "--- Mission File 02543 --- 8 days ago, contact with Galatic Federation trooper squad Bravo was lost. --- Contract Agreement --- Locate Federation troopers and render assistance. --- Data Confirmation --- Last transmission received from a rogue planet located in the Dasha region called Aether." —Samus Mission File (Metroid Prime 2: Echoes)