Gei Hinnom

Gei Hinnon is a location in Mass Effect 2. This planet is in the system Sheol. The planet may be named after Gei Hinnom, a valley near the city of Jerusalem, that is associated with eternal destruction and as an entrance to the underworld by Jews. Varren are one of the inhabitants of this planet. The planet is landable.

Reference
Mass Effect 2 Planetary Exploration Dev Diary. This diary shows the process of the player choosing to land on the planet, and a sequence of the Kodiak Drop Shuttle landing on the planet. The landing zone is in the northern hemisphere.