Md. Code, Local Government § 4–401

(a) Subject to subsections (b) and (c) of this section, the legislative body of a

municipality may enlarge its boundaries by annexation as provided in this subtitle.

(b) The power of annexation applies only to land that:

(1) is contiguous and adjoining to the existing boundaries of the

municipality; and

(2) does not create an unincorporated area that is bounded on all

sides by:

(i) real property presently in the boundaries of the

municipality;

(ii) real property proposed to be in the boundaries of the

municipality as a result of the proposed annexation; or

(iii) any combination of real property described in item (i) or (ii)

of this item.

(c) A municipality may not annex land that is in another municipality.