Last month, the river line took the decision to pause Rhine and Danube bookings until 13 September and has so far cancelled 20 sailings on both rivers.

At the time, Riviera said it believed it was "one of the very few operators" to have stopped selling the rivers due to the low water levels

Not only has Riviera started selling the itineraries on the rivers again, it has also created new sailings to ensure operations can continue.

On the Danube, for instance, Riviera's Vienna & the Danube's Wachau Valley River Cruise, plus Budapest departure now features a "comfortable" rail journey between Budapest and Vienna rather than a lengthy coach transfer.

While on the Rhine, the alternative Cologne, Amsterdam, Kinderdijk & Medieval itinerary takes guests north towards the Netherlands and Belgium.  

The new itineraries are visible on the website with pop-up boxes outlining which ones have been amended.

Its website says: "River conditions across parts of the Rhine and Danube remain exceptionally low and continue to vary significantly from one location to another.

"We have guests sailing with us today and further departures approaching, so every cruise continues to be assessed individually.

"Rather than simply waiting for river conditions to change, we are operating carefully planned alternative itineraries built around sections where we have greater operational confidence, while retaining the destinations, experiences and time on board that make a Riviera river cruise special."

Riviera explained that customers can either choose to travel the amended itinerary or, if they decide its not right for them, they will have the option of cancelling and receiving full refund.

It has also launched a dedicated Facebook group to provide agents and their clients with the latest information about the rivers it operates on.

Updates, expert guidance and real-time support will be posted on the new Facebook group, Riviera Travel Official – Low Water Updates, alongside the operator's River Cruise Update Centre, which was announced at the height of the crisis in the summer.