Source : Webster's Revised Unabridged Dictionary (1913)

Reefy \Reef"y\ (-?), a.
   Full of reefs or rocks.

Source : WordNet®

reefy
     adj : full of submerged reefs or sandbanks or shoals; "reefy
           shallows"; "shoaly waters" [syn: {shelfy}, {shelvy}, {shoaly}]