Once again help needed on a map and the courses of Rivers

[waldronate]

From the post where that map first appeared:

"Basically all the lands west of the river (the area marked "A") are relatively dry anyway, they are grasslands where mongolian style tribal nomads herd their livestock, and the place looks basically like something between the American prairie and the Mongolian steppe. So even if the central part of the continent (the area marked "B") is really dry to the point of being a desert or very arid steppe, it kind of suits the general climate of the place and its cultures."

[amberroberts09]

From the post where that map first appeared:

"Basically all the lands west of the river (the area marked "A") are relatively dry anyway, they are grasslands where mongolian style tribal nomads herd their livestock, and the place looks basically like something between the American prairie and the Mongolian steppe. So even if the central part of the continent (the area marked "B") is really dry to the point of being a desert or very arid steppe, it kind of suits the general climate of the place and its cultures."

OK...I thin 1.2 times the circumference of earth if the 90 degree line will be right. Not sure....