With the British reoccupation of the Cape, he settled at Plettenberg Bay in the Eastern Cape, collecting botanical specimens for Joseph Mackrill (1762-1820), a practitioner with a special interest in medicinal plants.
The peak was first mapped in 1576 during a voyage by the Portuguese navigator and cartographer, Manuel de Mesquita Perestrelo, when his ship put in at Plettenberg Bay, which he named 'Bahia Formosa' or 'beautiful bay'.
Graham spent nine months in South Africa, calling on ports along the southern edge of the continent including East London, South Africa, Port Elizabeth, Plettenberg Bay, Knysna, Stilbaai, Struisbaai, Gordon's Bay and finally Cape Town.
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Places he marked on his chart were Cape da Boa Esperança, Cape False, Cape Agulhas, Cape Infanta, St Sebastian Bay, Cape St Blaize (Cabo de São Bras = Mossel Bay), Ponta Delgada (Point Slender = Robberg), Formosa Bay, Formosa Peak, St Francis Bay, Cabo de Arrecife (Cape Recife), St Lucia (landed there on 13 December 1575, day of the Feast of Santa Lucia),
The N2 connects Cape Town with Durban, and it serves the South African cities of Port Elizabeth, Plettenberg Bay, Margate, and the iSimangaliso Wetland Park.