The National Marine Fisheries Service (Service) propose to designate critical habitat for the Rice's whale ( Balaenoptera ricei) by designating waters from the 100 meter (m) isobath to the 400 m isobath in the Gulf of Mexico (GOMx), pursuant to section 4 of the Endangered Species Act (ESA). They have considered economic, national security, and other relevant impacts of the proposed designation. They are not excluding any particular area from the critical habitat designation. They seek comments on all aspects of the proposed critical habitat designation and will consider information received before issuing a final designation. Written comments and information must be received by 22 September 2023. Virtual public hearings will be held on 24 August 2023 and 30 August 2023. Requests for additional public hearings must be made in writing by 7 September 2023. POC is Grant Baysinger tele (727) 551–5790; or Lisa Manning tele (301) 427–8466. (Federal Register 24 July 2023 [Proposed Rule] Pages 47453-47472)