Prayer: Praying on Vast Expanses and Un-walled Land
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 865
It is permitted to perform prayers on a vast expanse of land even if its owner is a minor or insane, or he does not consent to prayers being performed there. Similarly, it is permitted to perform prayers without the owner’s consent in gardens and on land that do not have gates or walls. However, in this case, if one knows that the owner does not consent, he must not use it. If the owner is a minor or insane, or if one supposes that he does not consent, the obligatory precaution is that he must not use it nor perform prayers there.