The charbagh
The fourfold garden: a walled square divided by water channels into quarters, with the tomb at its centre or at the river end.
The rules it illustrates
The fourfold garden. Lay out the garden as a walled square divided into four by raised walks with water channels on the two axes, and divide each quarter again.
Where it appears in the book
In the styles Persian and Mughal garden, Mughal.
In the chapters The Islamic World, Gardens and Landscape.