Maryland Waters. A person may not catch, attempt to catch, or possess any surf clams harvested from Maryland waters which extend from the Maryland shore to 3 miles offshore. Offshore Waters. A person may not possess or land surf clams harvested from offshore waters, which extend from 3—200 miles offshore in violation of the: Catch limit established in 50 CFR 648; or Size specifications established in 50 CFR 648. A person may not catch, possess, or land surf clams when the National Oceanic and Atmospheric Administration closes the fishery in accordance with 50 CFR 648.