The crossword solution for the term 'A Mariana Island' is 'Guam', which is a small island in the western Pacific Ocean. It is the largest and southernmost of the Mariana Islands, and is an organized, unincorporated territory of the United States. Guam has a rich history, having been colonized by Spain, the United States, and Japan at various points in its history. It is now a popular tourist destination, known for its beautiful beaches and diverse culture.