Portuguese to English Other Ships, Sailing, Maritime Bodies of water

CONTEXT - d) As dos rios e de suas desembocaduras; e) As dos lagos, das lagoas e dos canais; f) As dos arquipélagos;
g) As águas entre os baixios a descoberta e a costa;

I'm thinking something along the lines of "open shallows", but then what do I know?

Cheers!!