Spain's King Felipe VI and Queen Letizia arrived shortly after midday on 3 November in the Valencia region. The devastating floods in the area caused the death of more than 200 people, AFP reported.
The royals are accompanied by Prime Minister Pedro Sanchez. They have visited Payport, one of the worst-hit towns. Later in the day they are expected to go to Chiva, which is another affected city close to Valencia.
Hopes of finding survivors have diminished five days after torrents of muddy water destroyed towns and infrastructure in Spain's worst such disaster in decades.
Almost all the dead are in the Valencia area, where thousands of security and emergency workers are frantically clearing debris and mud in search of bodies.
Describing "the worst natural disaster in our country's recent history", Prime Minister Pedro Sanchez earlier said it was the second deadliest flood in Europe this century.
The government has accepted the request of the leader of the Valencian region for 5,000 more troops and has informed Sanchez of the deployment of 5,000 more police and civil guards.
Spain is carrying out its largest peacetime deployment of military and security force personnel. | BGNES