It is also the eastern boundary of the Municipality of Rockdale and of the suburbs of Kyeemagh, Brighton-Le-Sands, Monterey, Ramsgate Beach, Sans Souci, Dolls Point and Sandringham.

These marshes and mangroves restricted access from the north to what became the St George district south of Cooks River.

The shells found on the beach after this disaster were those of molluscs inhabiting the mudflats of the Georges River and southern part of Botany Bay.

Before the third runway of Sydney Airport was extended in the late 1950s, nereid worms were abundant on sand flats at the northern end of the beach.

These sand flats were covered with very shallow water which warmed in the sun during daylight hours, encouraging the colourful worms to emerge from their burrows.

By contrast, at the northern end of the area, Muddy Creek overflowed frequently, leaving behind a much richer alluvial soil which was suitable for the growing of vegetables.

Local government assumed much of the responsibility for management of the district, including the settlements along the foreshore of the bay, collectively known as Lady Robinson's Beach.

Gradually, over time, these settlements along the coastline increased in size until each was given its own post office and independent suburban status.

Between Lady Robinsons Beach and The Grande Parade, which has housing along its western border only, lies Cook Park.

In the 1950s the Cook Park Camp at Kyeemagh was closed and the high sand dunes were cleared so that a second swimming baths could be built.

One consequence of this change in position of the mouth of the river also meant the shortening of and other modifications to Lady Robinsons Beach.

[4] Consequentially, new signs were installed, encouraging people to swim in netted areas only as the nearby sand banks can create the semblance that waters are shallow, when there is actually a deep river channel with a strong current, which is the part of the beach that is deceptively dangerous with shifting sands, a big drop-off and rips.

The Council said these incidents were caused by the staunch changes to the beach through erosion and sand build-up along the beachfront on Botany Bay, since the construction of the third runway at Sydney Airport.

[5] Lady Robinsons Beach has not been identified as a coastal erosion hotspot, due to the fact that there are no houses in the area that are threatened.

[6] In January 2019, at the netted Brighton-Le-Sands beach, a shark was spotted swimming near the shore, causing a commotion among families with children.