A Saudi official has hinted that the kingdom was moving forward with a plan to dig a canal that would turn the neighbouring Qatari peninsula into an island, amid a diplomatic feud between the Gulf nations.

"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," Saud al-Qahtani, a senior adviser to Crown Prince Mohammed bin Salman, said.