… That is where the Ten Tribes and Noah’s Floodwaters went.

These historical quotes say it best.  Three of Joseph Smith’s faithful followers described his teachings in these writings.

Orson Pratt, Letter Box of Orson Pratt, Church Historian’s Office, Letter to John C. Hall, December 13, 1875. [Quoted in R. Clayton Brough, "The Lost Tribes", Horizon Publishers, 1979, p. 50.]
The Prophet Joseph [Smith] once in my hearing advanced his opinion that the Ten Tribes were separated from the Earth; or a portion of the Earth was by a miracle broken off, and that the Ten Tribes were taken away with it, and that in the latter days it would be restored to the Earth or be let down in the Polar regions. Whether the Prophet founded his opinion upon revelation or whether it was a matter of mere speculation with him, I am not able to say.

Oliver B. Huntington, The Young Woman’s Journal, Vol. 3, No. 6 March 1892, p. 264.
One truth after another men are finding out by the wisdom and inspiration given of God to them.
The inspiration of God caused men to hunt for a new continent until Columbus discovered it. Men have lost millions of dollars, and hundreds of lives to find a country beyond the north pole; and they will yet find that country – a warm, fruitful country, inhabited by the ten tribes of Israel, a country divided by a river, on one side of which lives the half tribe of Manasseh, which is more numerous than all the others. So said the Prophet. At the same time he described the shape of the earth at the poles as being a rounded elongation, and drew a diagram of it in this form:

Which any one can readily see will allow the sun’s rays to fall so near perpendicular to the center that that part of the earth may be warmed and made fruitful. He quoted scripture in proof of his theory which says that “the earth flieth upon its wings in the midst of the creations of God,” and said that there was a semblance in the form of the earth that gave rise to the saying.
Cedar Fort, Utah,
Feb. 6, 1892.

 

Philo Dibble, as quoted in Norman C. Pierce, “3½ Years,” n.d., n.p., p. 129; which paraphrases Matthew W. Dalton, “A Key to This Earth,” 1906, [p.?].
The Hon. Philo Dibble of Springville, Utah, onetime bodyguard and intimate friend of the Prophet Joseph, is said to have received a diagram from the Prophet in 1842, which indicated the arrangement of this earth as a triple planet at the time when the Ten Tribes were directed to the northern sphere.

The diagram appears much as would one large and two small balls spaced close together; the larger ball in the center representing the earth. It is pointed out that the Ten Tribes attained this northern planet by means of the axis that joined them together, and the triple arrangement of these planets gives a literal significance to the passage in the Doctrine and Covenants, 88:45, “The earth rolls upon her wings, and the sun giveth his light by day, and the moon giveth her light by night, and the stars giveth their light, as they roll upon their wings in their glory, in the midst of the power of God.” Here it is pointed out that many of the stars are in double and triple arrangement, although they may not be touching each other.

This author also points out that the northern planet also provided the place from which the water came and receded during the great baptismal flood of Noah’s day. And it is there that the great surplus of water will go when the continents are made into one land mass again as they were before the days of Peleg. Some believe that the seeming nearness of such a planet is what inspired construction of the Great Tower of Babel in a vain attempt to reach another world of higher order, – to reach heaven as it were.

 

By: Captain Moroni