The name of the country the monk visited was Sunnaparantha. (now Arabia)
They also claim that there was a temple in Arabia made of sandalwood exported from Sri Lanka.
It appears this account is found in a book named Divyavadana.(දිව්යවදානය )
https://www.accesstoinsight.org/tipitak ... .than.html"Lord, there is a country called Sunaparanta. I am going to live there."
"Punna, the Sunaparanta people are fierce. They are rough. If they insult and ridicule you, what will you think?"
"If they insult and ridicule me, I will think, 'These Sunaparanta people are civilized, very civilized, in that they don't hit me with their hands.' That is what I will think, O Blessed One. That is what I will think, O One Well-gone."
The following video (provided for source reference only) is in the Sinhalese language. The presenter was a blind academic in Sri Lanka scholar in theosophy. He got some incredible knowledge in all major religions. The video is about that there was Buddhism in Sri Lanka before the visit of Arahant Mahinda. To add some grain of salt he argues Mecca is that old temple!!