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Sydney Harbour – 8 interesting things you should know!

Sydney Harbour – 8 interesting things you should know! A report by the Sydney Institute of Marine Science, reveals some very interesting secrets lying in Sydney Harbour.

One Sydharb

1: One Sydharb is an official Australian unit of measurement. It is used to measure volume and is equivalent to 500 gigalitres. Incredibly, this is the volume of water in Sydney Harbour.

The beautiful Sydney Harbour – One Sydharb is an official Australian unit of measurement.

2: Sydney Harbour is also known as Port Jackson. It is 19 km long with an area of 55 km². A source of confusion has been the definition of “Sydney Harbour”. The estuary (see point 4) does not have one official name; instead, there are five formally defined parts, of which Sydney Harbour is one. All five together are sometimes called greater Sydney Harbour, while the combined parts of Sydney Harbour, North Harbour and Middle Harbour are collectively known as Port Jackson.


3: Over 586 species of fish are found in Sydney Harbour. This is more than you would find off the coast of the United Kingdom. During summer, recreational fishers caught an estimated 74,000 tonnes of fish. Interestingly, the NSW Government has a recommended maximum intake. No fish or crustaceans caught west of the Sydney Harbour Bridge should be eaten. Release your catch. For fish caught east of the Sydney Harbour Bridge, generally no more than 150 grams per month should be consumed. Interestingly, I read interviews with locals who live on Sydney Harbour. Many people catch and eat more than the guidelines with no adverse effects. Sydney Harbour is getting cleaner by the year.

A Dusky Flathead, one of many species of fish found in Sydney Harbour.

drowned river estuary

4: Amazingly, the harbour is a drowned river estuary. It was carved out of the sandstone about 29 million years ago. About 17,000 years ago, the sea level rose flooding the river and creating the harbour. As a result, we have the beautiful Harbour we all know and love. The Sydney Harbour Estuary comprises Port Jackson and its major tributaries – Parramatta River, Lane Cove River and Middle Harbour.

Looking across Sydney Harbour to the city. This is one view Troll Tours takes our passengers to see.

5: 20,000 boats (approximately) are registered in the harbour, which is about 52 boats per square kilometre.

swimmable beaches

6: There are over 20 swimmable beaches nestled in the harbour. 77km of the original 322km of shoreline has been reclaimed.

The famous Bondi Beach. ©Tourism Australia

Sydney’s Bridges

7: Five bridges cross the harbour: the Sydney Harbour Bridge, the ANZAC Bridge, the Gladesville Bridge, the Ryde Bridge, and the Silverwater Bridge. However, on our 3 Bridges ride we take you over 3 of these bridges. Also included are a couple of minor bridges. Most Sydneysiders don’t know these minor bridges. All bridges have spectacular views!

The ANZAC Bridge and the Sydney Harbour Bridge. Two of the bridges we ride over on the 3 Bridges ride.
©Tourism Australia

A secret reef

8: An unpublished NSW government report, reportedly, has mapped a secret reef in the harbour. Also, marine scientists have been examining the little known coral reefs of Sydney to try and understand more about coral survival. Mangroves are often known as ‘nurseries of the sea’ for the role they play in supporting small fish and other marine creatures.

Mangroves are an extremely important part of Sydney’s waterways.
Source: UNESCO

In conclusion, we hope you have enjoyed this blog, Sydney Harbour – 8 interesting things you should know!
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Us, COVID19 and Point to Point – Book Now!

Us, COVID19 and Point to Point – Book Now! What can we say about this relationship?


COVID19 – the virus – Coronavirus or as Troll calls it – Coniverus, has certainly changed our lives. Probably forever. We decided to close down for 2 months though we could actually have stayed open. Troll Tours runs under the NSW Government Point to Point system. This means social distancing is not applicable. As long as we follow the hygiene practices, as outlined by the Government, we are able to provide our tours.

Troll Tours is now fully operational with all our tours. We follow the NSW Government rules on COVID19, for Harleys and trikes. Hygiene has always been a big deal for us so this really is nothing new.

Point to Point

From 1 February 2018, all point to point transport service providers (Troll Tours, taxis etc) need to pay a temporary $1 Passenger Service Levy on all trips (including taxi, hire car and rideshare) taken in NSW. Apparently this is to help people like mums and dads and retirees who have put their lifetime savings into the taxi industry and are now doing it tough. The levy is funding an industry adjustment assistance package of up to $250 million.

Basically, Uber, Olacabs etc have made a huge indent into the taxi industry. This means the taxi licences are not worth as much as they used to be. NSW Government data in 2017 shows Sydney licences in February were worth, on average, $200,000, down from $406,000 in October 2012.

taxi licences

This has now crashed from $115,500 (average for August 2018) to around $70,000 in June 2019 and a little more in July 2019. We can hardly believe it but we do believe it is true. We really do appreciate how hard it is for the taxi licence owners. The thing is, we don’t understand what it has to do with us. However, it is what it is so we have to put up and pay up.

The NSW government website says, “Service providers can absorb the cost of the levy or pass the levy on to the passengers. If the levy is passed on, GST is payable and $1.10 will be added to your fare. The levy may affect the cost of your trip – you can check whether the levy is being passed on with your driver or service provider before your trip commences or when you make your booking.”

However, we at Troll Tours, don’t pass the levy on to our passengers. We absorb as many costs as we can. Our reward is our passengers loving our tours! 😉😎😁 Reviewing and writing about your ride is our reward!

Us, COVID19 and Point to Point – Book Now! Yes, it is a weird combination but it doesn’t stop us giving you the Ride of your Life! Contact us now or 0410 46 47 40 for the Adventure of a Lifetime!

Our Harley riders clean their Harleys before every ride. They will also provide hand sanitiser.

Happy Mother’s Day!

Happy Mother’s Day to all the different types of mums in our lives!

To all the mothers, grandmothers, godmothers, stepmothers, mothers-in-law, and women who love with a mother’s heart. 💕

Photo credit: Tourism Australia

Happy Mother's Day from near the Sydney Opera House
Happy Mother’s Day from near the Sydney Opera House