This action would designate critical habitat for the Loggerhead sea turtle pursuant to the Endangered Species Act of 1973, as amended. The loggerhead sea turtle was originally listed worldwide as a threatened species on July 28, 1978. No critical habitat was designated for the loggerhead at that time. On September 22, 2011, NMFS and the U.S. Fish and Wildlife Service jointly published a final rule revising the loggerheads listing from a single worldwide threatened species to nine Distinct Population Segments. The two Distinct Population Segments occurring in U.S. jurisdiction are the Northwest Atlantic Ocean Distinct Population Segment (range defined as north of the equator, south of 60 N. lat., and west of 40 W. long.) and the North Pacific Ocean Distinct Population Segments (range defined as north of the equator and south of 60 N. lat.). For the 2011 final listing rule, NMFS and the U.S. Fish and Wildlife Service found designation of critical habitat to be not determinable. This action will satisfy the provisions under the Endangered Species Act requiring critical habitat to be designated for these Distinct Population Segments.