It seems the UFC’s Fight Island is no longer a mysterious place. According to Combate’s Marcelo Russio, the location set to host foreign UFC cards amidst the coronavirus pandemic starting on June 27 is Abu Dhabi, in the United Arab Emirates.
https://www.bloodyelbow.com/2020/6/6/21282537/report-ufc-fight-island-revealed-abu-dhabi-mma-news
https://www.bloodyelbow.com/2020/6/6/21282537/report-ufc-fight-island-revealed-abu-dhabi-mma-news