Midgard is Earth. Specifically, it is the Earth as we knew it in the 9th century. The Asgardr have a colony somewhere in Norway or Denmark.

Atmospheric Composition: Standard Oxygen-Nitrogen Mix

Hydrosphere: 75%

Lithosphere: Light Metals predominate

Gravity: 1G

Diameter: 7,917 miles

Temperature Extremes: -30 to 110 degrees

Tectonic Activity: 12 lithospheric plates, wide-spread evidence of subduction, extensive orogenic processes.

Sentient Life Forms: Midgardr, Asgardr, few Jotnar

Population: Midgardr 310,000, Asgardr 12,500, Jotnar c1000 (?)

Cultural Basis: Family-clan-tribal units dominate, Nation-states ruled by force of arms.

Major Religion(s)Christianity dominates most of European continent near Asgardr Colony. Islam and Buddhism elsewhere. Spirit-based shamanic traditions over most of the planet.

Traded Commodities: No interplanetary trade.

Threatening Lifeforms: Some rare Eitrlings (Trolls, Ogres)

Notable Physical Phenomena: Large Moon (Luna)