The answer in 20 seconds

Baikonur is in Kazakhstan. Russia operates the complex under a lease, which is why the site is closely associated with Russian spaceflight but is not Russian territory.C1

6,717 km²
area of the Baikonur complex
National Space Center of Kazakhstan
2050
end of the current Kazakhstan–Russia lease agreement
National Space Center of Kazakhstan
1955
year construction began during the Soviet period
NASA

Why the confusion persists

Baikonur was built by the Soviet Union and became the launch site for Sputnik and Yuri Gagarin’s flight. Russian agencies continue to operate many launches there. That institutional continuity creates a powerful association with Russia, but a site’s history and operator are not the same as its sovereign location.

The complex passed to Kazakhstan when the Soviet Union dissolved. The two states then established a lease arrangement under which Russia uses and operates the facility. The lease is an important fact precisely because it distinguishes operation from ownership and geography.C2

The city and the launch complex are not the same thing

There are two related names in this story. The Baikonur Cosmodrome is the large launch complex, while the city of Baikonur is the nearby settlement built to support it. Both are in Kazakhstan. The Russian lease gives the complex and the city a special administrative and operational relationship, but it does not turn the area into a Russian region or change Kazakhstan’s international border.

Photographs of launch pads, Russian spacecraft and Russian mission control can make the legal geography invisible. A facility can be operated by a foreign state under treaty while remaining in another country’s territory. The relevant question is therefore not only who launches rockets there, but where the site is located and which agreement governs its use.C3

Why the association with Russia is so strong

Baikonur is inseparable from the Soviet space programme. Sputnik was launched from the site, and Yuri Gagarin’s 1961 flight made it one of the most recognisable places in space history. Russia inherited much of the institutional infrastructure, technical workforce and launch practice after 1991. Those facts explain the association; they do not provide evidence that the site is geographically Russian.

The accurate short description keeps all three layers together: Baikonur is in Kazakhstan, Russia operates it under a lease, and its spaceflight history is largely Soviet and Russian. Leaving out any one of those layers produces the misleading shortcut this article is correcting.

For readers checking a map, the key point is simple: the lease explains access and administration, not a transfer of sovereignty. This is why “Russian-operated” and “located in Kazakhstan” are both accurate at once.

That wording also avoids treating a legal arrangement as a cultural verdict about Kazakhstan or Russia. It keeps geography, law and operational history distinct.

Better wording

Say “Baikonur is a Kazakhstan-based spaceport leased and operated by Russia”, not “Baikonur is in Russia.”C3