RIYADH — Custodian of the Two Holy Mosques King Salman and Crown Prince Muhammad Bin Salman have sent separate messages of congratulations to Thailand King Maha on the eve of his country’s National Day.

In their congratulatory messages, the Custodian of the Two Holy Mosques and the Crown Prince wished the king good health and happiness, and further progress and prosperity to the friendly government and people of Thailand.

The National Day, which is observed on Dec. 5 every year, is a public holiday in Thailand. If Dec. 5 falls on a weekend, the holiday is observed on Monday.

The day commemorates the birthday of the late King of Thailand, Bhumibol Adulyadej. It is also celebrated as Father's Day in Thailand.