The WTS believes that the human population was fairly small, centered around the still angel-guarded garden of Eden (yes, they teach it was destroyed in the Flood). So there were no people in those other areas, it could be as some geologists (and other scientists) that there was only one continent so all the animals were nearby.
Just reporting not supporting. I thought it was pretty wild too.
Look up Isaac Vail online and his theory of the water rings above the earth. The WTS used this for years and finally phased it out.
*Vail, Isaac Newton (1840-1912)
Spiritual and perhaps actual father of the "vapor canopy" idea; instrumental in propagating various "flood geology" notions; Pennsylvania Quaker schoolteacher, oil and gas prospector; extrapolated from the older scientific nebular hypothesis of the origin of the solar system to his "annular theory of earth history"; according to this the earth was originally surrounded by Saturn-like rings or canopies of aqueous vapor, which one by one collapsed on the earth, burying fossils in "a succession of stupendous cataclysms, separated by unknown periods of time"; Noah's Flood resulted from the last remnant of this vapor canopy; these ideas were first published in 1874 in a pamphlet titled "The Waters Above the Firmament": The Earth's Aqueous Ring; or, The Deluge and Its Cause, then in 1885 in a 400-page book titled The Story of the Rocks; or, The Earth's Annular System, and in 1912 in The Earth's Annular System: or, The Waters Above the Firmament; Vail's ideas were accepted in toto by the Watchtower Society and taught until the mid-1960s; the earliest mention of Vailian notions is in the December 1881 issue of Zion's Watch Tower (pp. 1-2; 299-300 Reprints); the first explicit mention of Vailian notions is apparently in the December 1, 1912 issue of The Watch Tower (pp. 372-3; 5139-40 Reprints); Vailian notions formed a major part of C. T. Russell's Photo-Drama of Creation (1914), Rutherford's 1927 book Creation, and chapter 4, "Earth's Creation", of the 1943 book The Truth Shall Make You Free; the Watch Tower Publications Index 1930-1985 lists six instances where the "annular theory" is referenced in WTS publications.
That the Watchtower Society taught explicitly Vailian notions through the mid-1960s can be seen in the following:
w62 9/15 p. 575: "When [Genesis] says that the springs were broken and the floodgates were opened it means that God caused the forces that held the great water canopy in suspension to be overcome and thus permitted the waters to pour down upon the earth, not in any global splash but as through floodgates into certain channels, particularly at the poles".
w64 1/15 pp. 54-5: "Up until Noah's six hundredth year of life the 'heavens in ancient times' were different or had a feature different from what the heavens or outer space have now. They had a water ring high in suspension above the earth and containing billions of tons of water. According to Genesis 1:6-8, God's word of command put that water ring up there in the heavens. It covered the earth like a canopy, so that the earth was standing 'in the midst of water by the word of God.'"
Sometime between 1961 and 1967 the Society seems to have got hold of Morris and Whitcomb's The Genesis Flood, and adapted many of its ideas to previous JW notions on creation and the Flood. In the 1967 book Did Man Get Here By Evolution Or By Creation? there appeared for the first time a raft of new references, many of which also appeared in The Genesis Flood. The Society also changed many of its older notions, updating them in accord with ideas set forth in Morris and Whitcomb's book. For example, the Society finally jettisoned the explicitly Vailian idea of a "water ring" and replaced it with the "vapor canopy" idea espoused in The Genesis Flood. It continued to teach that the "creative days" were 7,000 years long whereas Morris and Whitcomb taught six-literal-day creationism.
During the next 30 years Watchtower writings on evolution and creation often closely followed those found in young-earth creationist literature, except for the young-earth aspect. From 1967 until about 1983 the Society closely followed Morris and Whitcomb's ideas on flood geology, such as explicitly denying the existence of ice ages, claiming that most of the earth's sedimentary strata formed during Noah's Flood, and so forth. It's quite an eye-opener for someone raised as a JW during those years to find how much Watchtower teaching then had in common with that of its arch-enemies, those trinitarian, hell believing, world-to-be-burned believing, Satanic members of Christendom like the Seventh-Day Adventists and the Fundamentalist community.
After about 1983, apparently about the time the Society first roundly condemned young-earth creationist beliefs, it quietly dropped the notions of "flood geology" that it had been teaching in one form since 1881 and in another form since 1967. The way the Society is going, it wouldn't surprise me if, after the present old men of the Governing Body and their contemporaries die off, the Society jettisoned many more of its traditional notions about creation and the Flood.