Abstract
ALONG the southern shores of South Africa there are streams which, flowing into sunken valleys, form lagoons only open to the sea at intervals of months or years. Their mouths are closed by wide bars over which the dunes move in their march along the coast. At high tides in stormy weather, waves wash over the bar and in time the waters of the lagoon rise above sea-level. When floods from the land make the river rise rapidly, the bar is breached and the waters of the lagoon pour out into the sea until it becomes a shallow estuary and so remains for a few weeks.
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