(a) The unit area must—

(1) Consist of tracts, each of which must be contiguous to at least one other tract in the unit, that are located so that you can perform operations and production in an efficient and logical manner; and

(2) Include at least one NPR-A lease.

(b) BLM may limit the size and shape of the unit considering the type, amount and rate of the proposed development and production and the location of the oil or gas.