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. The power of annexation applies only to land that: is contiguous and adjoining to the existing boundaries of the municipality; and does not create an unincorporated area that is bounded on all sides by: real property presently in the boundaries of the municipality; real property proposed to be in the boundaries of the municipality as a result of the proposed annexation; or any combination of real property described in item (i) or (ii) of this item. A municipality may not annex land that is in another municipality.