; (B) to study, plan, and implement unified coastal zone policies with respect to such areas; and (C) to establish an effective mechanism, and participate in mediation under subsection (h), to identify, examine, and cooperatively resolve mutual problems with respect to the marine and coastal areas which affect, directly or indirectly, the coastal zone. (2) Agreements or compacts Subject to paragraph (3), the coastal zone activities described in this subsection may be conducted pursuant to interstate or regional agreements or compacts. (3) Permissible agreements or compacts Two or more coastal States may negotiate and enter into any interstate or regional agreement or compact to do the following unless the agreement or compact conflicts with any law or treaty of the United States: (A) To develop and administer coordinated coastal zone planning, policies, programs, and dispute resolution. (B) To establish executive instrumentalities or agencies that such States consider necessary for the effective implementation of an agreement or compact under this subsection. (4) Binding effect An agreement or compact under paragraph (3) shall be binding and obligatory upon any State or party thereto without further approval by Congress. . (b) Rule of construction Nothing in this section, or the amendments made by this section, may be construed to affect any mediation that was commenced before the date of enactment of this Act. 105. Coastal zone enhancement grants (a) In general Section 309(a) ( 16 U.S.C. 1456b(a) ) is amended— (1) by amending paragraph (1) to read as follows: (1) Protection, restoration, or enhancement of existing coastal wetlands, seagrass beds, coral reefs, oyster habitat, and marine habitat, or creation of new coastal wetlands.