shoal - Area of sand or shingle just below the surface of the water at low water....cf. Bank. (iii)

bank - (iii) Raised shelf or ground in a sea, lake or river usually covered by water.....cf. Sandbank.

shelf - Strip of near horizontal mountain terrain delimited by steeper slopes, both above and below...cf. Ledge.

bar - (i) Bank of sand, mud or shingle formed in shallow water across the mouth of a river or the entrance to a bay or harbour.......cf. shoal.
(ii) Submerged ridge of bed-rock in a water feature....cf. rock, reef.

http://www.dpiw.tas.gov.au/internnsf/WebPages/JGAY-53N82A?op...

Alto-fundo - 1 Região do fundo do mar que se eleva em relação a outras áreas, não atingindo, entretanto, altura suficiente para colocar em risco a navegação (Aulete)

Porto do Recife - Canal de acesso e bacia de evolução - Existência de profundidades menores e altos-fundos
Porto do Recife - Fairway and evolution basin - Existence of minor depths and shoal
http://www.mar.mil.br/dhn/chm/avgantes/folheto/folheto132008...