Mohammed bin Salman arrived in Abu Dhabi in what will be his second trip to the UAE in about a year.
His visit underlines the close and historic relationship between the two countries that are cooperating across defence, trade and tourism.
It is expected he will meet Sheikh Mohamed bin Zayed, Crown Prince of Abu Dhabi and Deputy Supreme Commander of the Armed Forces, along with a host of other ministers and officials to discuss ways to further strengthen ties.
Co-operation is taking place on many levels, to the extent that reports suggest tourists could be able to obtain a joint Saudi-UAE visa as early as next year.
In Riyadh this week, bank officials from both countries are meeting to discuss the challenges and opportunities for the two financial sectors.
Much of the impetus comes from the Saudi-Emirati Co-ordination Council, created to bring closer co-operation between the two countries in areas such as defence, politics and culture.
The two countries have continued to present a unified front on all the important issues facing the region down the years, from the oil embargo imposed on the US for supporting Israel in the 1972 war, to committing troops for the liberation of Kuwait in 1990 to the need, most recently, to restore the legitimate government in Yemen.
Both countries have stood side by side and, on occasions, fought side by side, to defend their core principles.
Creating a framework for this relationship began in earnest in 1981, with the formation of the Gulf Co-operation Council in Abu Dhabi.