The Kzin homeworld is called "Kzin" by all other races save the Kzinti, who call it "Homeworld" or "Kzinhome" in the Hero's Tongue.

It is the third planet orbiting the star 61 Ursae Majoris, has stronger surface gravity and both a longer day and year than Earth. It is also slightly colder, drier planet than Earth with more oxygen. It has two moons, the Hunter's Moon and the Traveler's Moon.

The Patriarch rules from a large palace on the world.

At the end of the last Man-Kzin War, around 2618, Kzin was occupied and disarmed by human armies.

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