Cilfach fôr yw bae sy'n cael ei amddiffyn gan benrhyn neu wal rhag y tonnau geirwon; mae amddiffynfa o'r fath naill ai'n naturiol neu'n waith gan ddyn i greu harbwr.
Effaith hyn yw fod y gywnt yn gostwng neu'n tawelu. Defnyddir y term "gwlff" i ddisgrifio bae mawr.
Math | cilfach ar draethlin, water area |
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