; and (2) by adding at the end the following: (3) Coastal barrier defined In this subsection, the term coastal barrier means— (A) a depositional geologic feature (such as a bay barrier, tombolo, barrier spit, or barrier island) that— (i) is subject to wave, tidal, and wind energies; and (ii) protects landward aquatic habitats from direct wave attack; and (B) all associated aquatic habitats including the adjacent wetlands, marshes, estuaries, inlets, and nearshore waters. . 507. Authorization of appropriations Section 9 of the Coastal Barrier Resources Act ( 16 U.S.C. 3508 ) is amended by striking $2,000,000 and all that follows through the end of the sentence and inserting $5,000,000 for each of fiscal years 2021 through 2025. . VI Coastal Zone Management Act amendments 601. Grants to further achievement of Tribal coastal zone objectives (a) Grants authorized The Coastal Zone Management Act of 1972 ( 16 U.S.C. 1451 et seq.) is amended by adding at the end the following: 320. Grants to further achievement of Tribal coastal zone objectives (a) Grants authorized The Secretary may award competitive grants to Indian Tribes to further achievement of the objectives of such a Tribe for such Tribe’s Tribal coastal zone. (b) Cost share (1) In general The Federal share of the cost of any activity carried out with a grant under this section shall be— (A) in the case of a grant of less than $200,000, 100 percent of such cost