The gulf experiences two large tidal flows each day between 7 and 9 metres (23 and 30 ft).
The town of Wyndham, the area's principal port lies on its eastern bank at the lower part of the gulf and is approximately 100 kilometres (62 mi) by road west-north-west of Kununurra. Cambridge Gulf is a gulf within a gulf, being at the southern extremity of the Joseph Bonaparte Gulf, in the Timor Sea.
The western shore of the gulf is backed by high sandstone hills that are 30 metres (98 ft) to 250 metres (820 ft) in height and with fringing colonies of mangroves and mudflats when the tide is low. Dense mangrove stands fringe the marshy area on the eastern shore of the gulf. Adolphus Island splits the southern end of the sound with a navigatable channel being found on the western arm.
On 17 September 1819 Philip Parker King on the survey cutter HMS Mermaid, who was mapping the entire north Australian coastline, had landed at Lacrosse Island, from where he noticed a "deep opening" to the south.
Lacrosse Island is situated in the entrance of a deep opening trending to the South-South-West towards some steep rugged hills.
This "deep opening" described would come to be known as the Cambridge Gulf in the days that followed. On 18 September 1819 King's journal states.
At last quarter ebb we got underweigh and proceeded to examine the opening by steering South-South-West towards the deepest part; at twenty-three miles from Lacrosse Island the gulf is divided by Adolphus Island into two arms; one of which trended to the South-South-East and the other to the South-South-West. As the western arm appeared to be of most importance we entered it and, with a strong flood tide, proceeded with great rapidity; as sunset approached we began to look for an anchorage, but found much difficulty on account of the strength of the tides, the great depth of water, and, as I at first thought, the unfavourable quality of the bottom: at last the anchor was dropped close to the south-west shore of Adolphus Island in the entrance of another arm which appeared to trend to the south-east under Mount Connexion.
It would seem from the description that this "arm" mentioned in the last sentence, would have been the Ord River, which would wait another 60 years before acquiring a name. The HMS Mermaid spends many days during which King discovered, mapped and named the Cambridge Gulf, of which historians tell us was named after the Duke of Cambridge. Curiously however, having first spotted the "deep opening" of the gulf on 17 September 1819, then spending 12 days within it, the gulf is not named by King in his journal until 29 September 1819 when he was leaving the gulf. Further research on the Duke of Cambridge at the time, reveals that Adolphus Island too was named after him, and that historians are absolutely correct in one way but not to the letter of King's words, as follows.
Having now cleared this extraordinary inlet which was named Cambridge Gulf in honour of His Royal Highness the Viceroy of Hanover, we bore up along shore to the westward, sufficiently near to it to have perceived any opening that might exist, and to make such remarks as were necessary for its delineation.
King named the gulf after the His Royal Highness the Viceroy of Hanover who was also the Duke of Cambridge at that time, as well as being Prince Adolphus. Adolphus Frederick, Duke of Cambridge, was Viceroy of Hanover, he was the son of King George III and was born at Buckingham Palace, London on 24 February 1774. At his death his official title was Field Marshal His Royal Highness The Prince Adolphus Frederick, Duke of Cambridge, Earl of Tipperary, Baron Culloden, Knight of the Most Noble Order of the Garter, Member of Her Majesty's Most Honourable Privy Council, Knight Grand Cross of the Most Honourable Military Order of the Bath, Knight Grand Cross of the Most Distinguished Order of Saint Michael and Saint George, Knight Grand Cross of the Royal Guelphic Order.
Alexander Forrest was the next European to explore the area in 1879, however the closest he got was to the junction of the Ord River and the Negri River, near the WA/NT Border, both of these rivers being named by him. On 2 August 1879 Forrest records in his journal the following.
No-one can regret more than I do, that I am unable to follow this magnificent stream to its mouth, which I have no doubt will be found in Cambridge Gulf – the whole of its waters in that case being in Western Australian territory. I have named this river the Ord, after his excellency the Governor of Western Australia who has taken so great an interest in this expedition.
By late 1884 some of the first settlers had begun to arrive in the Kimberley, travelling overland. By early 1885 people were arriving at the Cambridge Gulf to move inland in search for gold around Halls Creek, before the Port was named as Wyndham in 1886. During the 1886 gold rush up to sixteen vessels would be moored in the gulf waiting to dock.
- "Looksea Tours – Wyndham Cambridge Gulf Kimberley". 2009. Retrieved 21 February 2009.
- "128km Wyndham Radar". Retrieved 9 January 2012.
- "Australian Newspapers – The West Australian – The navigation of Cambridge Gulf". 1885. Retrieved 9 November 2010.
- "Ausanthrop – Australian Aboriginal tribal database". 2012. Retrieved 29 April 2012.
- "Captain Phillip P. King, R.N., F.R.S., F.L.S., and Member of the Royal Asiatic Society of London." (May 1825). "Narrative of a Survey of the Intertropical and Western Coasts of Australia. Performed Between the Years 1818 and 1822.". Chapter 7: John Murray, London. Retrieved 9 January 2012.
- Prince Adolphus, Duke of Cambridge (Titles and styles)
- "Exploration.". The West Australian. Perth: National Library of Australia. 27 February 1880. p. 3. Retrieved 8 January 2012.
- "Travel – Wyndham". The Sydney Morning Herald. 27 November 2008. Retrieved 9 November 2010.
- Durack, Mary,(1932) An outline of north Australian history from Cambridge Gulf to the Victoria River, 1818–1887. Journal and proceedings (Western Australian Historical Society), Vol. 2, pt. 12 (1932), p. 1–11
- Kununurra Historical Society Inc. Archive, Library, Museum & Research for history and images of Cambridge Gulf.