Rannamaari was a sea demon that haunted the people of the Maldives and had to be appeased monthly with the sacrifice of a virgin girl.

The statement is true because in Maldivian folklore and mythology, Rannamaari was indeed believed to be a sea demon that haunted the people of the Maldives. It was believed that Rannamaari brought misfortune and disaster to the islands if it was not appeased monthly with the sacrifice of a virgin girl. This belief was deeply ingrained in the cultural and religious practices of the Maldivian people for centuries, serving as a way to ensure their safety and well-being.