Land watered from underground canals. Historically, tax on this land was lower than ‘ushr, since they involved investment in irrigation.
Al-hawalah ala al-maqrwd
Hamish qadiyah
Al-dara'ib
Al-dinar al-aini
Al-irfaq
Al-’ard al-mubahah
Al-akl bi l-batil
Al-bai‘ al-batil
Al-sh‘irah
Al-suhbah