A Saudi official hinted on Friday the kingdom was moving forward with a plan to dig a canal that would turn the neighbouring Qatar into an island, amid a diplomatic dispute between the Gulf nations, The Guardian reported.

“I am impatiently waiting for details on the implementation of the Salwa island project, a great, historic project that will change the geography of the region,” The report quoted Saud al-Qahtani, a senior adviser to Crown Prince Mohammed bin Salman.

The plan, which would physically separate the Qatari peninsula from the Saudi mainland, is the latest stress point in a fractious 14-month long dispute between the two states.

In April the pro-government Sabq news website reported government plans to build a channel 60km long and 200m wide stretching across Saudi Arabia’s border with Qatar.

Part of the canal, which would cost up to 2.8 billion riyals ($750m), would be reserved for a nuclear waste facility, it said.

Five unnamed companies that specialised in digging canals had been invited to bid for the project and the winner would be announced in September, Makkah newspaper reported in June.

Saudi authorities did not respond to requests for comment and there was no immediate reaction on the plan from Qatar.

Saudi Arabia, United Arab Emirates, Bahrain and Egypt cut diplomatic and trade ties with Qatar in June 2017, accusing it of supporting terrorism and being too close to Riyadh’s arch rival, Iran.