- Is it necessary that an International cricket ground should has the boundary line in circle shape?Is it allowed by ICC to make it a square or ellipse or any other?
- What is the minimum and maximum area allowed for an international cricket ground?
- What is the maximum number of international cricket grounds that a country allowed to have?
Cricket is governed by two things, the Laws of Cricket and the Playing Conditions. The former are strict and do not change very often whereas the Playing Conditions allow different competitions to make adjustments to suit their needs while still conforming to the Laws.
In the case of international cricket, the International Cricket Council (ICC) maintains a set of playing conditions separately for Test Matches, ODIs and T20Is. These cover things like the uses of replays to assist Umpires DRS as well as heap of other aspects that vary between the formats.
The Laws don't appear to state any restrictions on the size of the boundaries, but there are details in the ICC's playing conditions. You can find these for the different formats here. As an example, here are the details for Test Cricket: