For centuries these estuaries were regarded as one of the major advantages for a port, since the natural scouring effect of the river guaranteed that adequate depths of water would extend far inland.
Kwiminyaka emininzi la machweba omlambo ayethathwa ngokuba zezona zinto zilungileyo kumazibuko enqanawa sukela oko izikhukulisi zendalo ziqaphele lo mlambo ziqinisekisile ukuba ubunzulu oboneleyo bamanzi buza kwandela kude emhlabeni.