Sagittarius Gap is the inter-arm gap between the Orion Spur and the Sagittarius arm, roughly 2.000 LY wide.
Inexperienced explorers, setting out from inhabited space and straight across the Gap towards the Lagoon Nebula, should take care to avoid the Aucocks Pocket near the southern edge of the Gap. This is a band of Brown Dwarf and T-Tauri sectors on the near edge of the Sagittarius Gap, approx. 2,000 - 2,500 LYs from Sol. Commanders are advised to plot a route at least 100 LYs above the galactic plane when approaching the Sagittarius Gap as this is usually sufficient to avoid the Aucoks Pocket.
The massive Eta Carinae Nebula is located in the eastern portion of the Sagittarius Gap.