On this world map, one can see more clearly how Master Marco Polo sailed from the Gulf of the Mangi to the east as far as the Peninsula of the Stags, where he met the pilot Sirdomap, who then guided him to the Island of Women, situated to the north and west.
Marco Polo famously described just such an island of women in his Travels, where in 3.31 he (or, rather, the ghostwriter who compiled his story) describes a pair of islands named Male and Female:
In the Island however which is called Male, dwell the men alone, without their wives or any other women. Every year when the month of March arrives the men all set out for the other Island, and tarry there for three months, to wit, March, April, May, dwelling with their wives for that space. At the end of those three months they return to their own Island, and pursue their husbandry and trade for the other nine months. (trans. Henry Yule)
Among the inhabited islands are the two islands of the fire-worshiping Amazons. The westernmost island is inhabited by men only; there are no women at all. The second island is inhabited only by women; not a single man lives there. Every year the men cross the passage between the two islands in their boats in the springtime. Every man seeks out a woman.... They stay about a month, then the men return to their island until the next year.... This is a long-established custom among them.
The Admiral also heard of an island further east, in which there were only women, having been told this by many people. […] He, however, believed the story, and that, at certain seasons, men came to them from the island of Carib, distant ten or twelve leagues. If males were born, they were sent to the island of the men; and if females, they remained with their mothers. (Journal of the First Voyage, January 6 and 16, 1493, trans. Clements Markham).
The Gargarians also, in accordance with an ancient custom, go up thither to offer sacrifice with the Amazons and also to have intercourse with them for the sake of begetting children, doing this in secrecy and darkness, any Gargarian at random with any Amazon; and after making them pregnant they send them away; and the females are born are retained by the Amazons themselves, but the males are taken to the Gargarians to be brought up; and each Gargarian to whom a child is brought adopts the child as his own, regarding the child as his son because of his uncertainty. (11.5.1, trans. H. L. Jones)
[Update: Much later, in 1225, Chau Ju-Kua tried noted the similarity between the traditional Chinese tale and that of the Arabs, and suggested there were two all-female lands, one a continent in the east and the other an island in the west (Chu-fan-chi 1.38.2).]
Olshin suggests that it is evidence that the author of the Rossi collection of supposed Marco Polo materials was displaying knowledge of Chinese geographic ideas, but the hoaxer of the maps was likely working from a version of the Fusang narrative, so that doesn’t really prove anything. The inclusion of an island of women seems like a fortuitous conflation of the Chinese reference with the genuine passage from the Travels and Classical sources. It’s worth noting that in the Liang Shu, the land of women wasn’t specified as an island (it’s apparently part of a semi-fictional mainland with Fusang), whereas in Classical and Arabic sources it is.