With the belief that Cumorah is in Ontario, County New York, now you can begin to research the appropriate documents supporting this idea. President Joseph Fielding Smith in Doctrines of Salvation, Chapter 12 “A Voice from Cumorah Witnesses of Book of Mormon” said the following:“This modernistic theory of necessity, in order to be consistent, must place the waters of Ripliancum and the Hill Cumorah some place within the restricted territory of Central America, notwithstanding the teachings of the Church to the contrary for upwards of 100 years. Because of this theory some members of the Church have become confused and greatly disturbed in their faith in the Book of Mormon. It is for this reason that evidence is here presented to show that it is not only possible that these places could be located as the Church has held during the past century, but that in very deed such is the case.

It is known that the Hill Cumorah where the Nephites were destroyed is the hill where the Jaredites were also destroyed. This hill was known to the Jaredites as Ramah. It was approximately near to the waters of Ripliancum, which the Book of Ether says, “by interpretation, is large, or to exceed all.” Mormon adds: “And it came to pass that we did march forth to the land of Cumorah, and we did pitch our tents round about the hill Cumorah; and it was in a land of many waters, rivers, and fountains; and here we had hope to gain advantage over the Lamanites.” CLICK HERE:

Letter to Emma-On the banks of the Mississippi, June 4th. 1834

“My Dear Companion, I now embrace a few moments to dictate a few words that you may know how it is with us up to this date. We arrived this morning on the banks of the Mississippi, and were detained from crossing the river, as there was no boat that we could cross in, but expect a new one to be put into the river this evening, so that we are in hopes, to be able to cross tomorrow, and proceed on our journey…

Now is the time for the Church abroad to come to Zion. It is our prayer day and night that God will open the heart of the Churches to pour in men and means to assist us, for the redemption and upbuilding of Zion. We want the Elders in Kirtland to use every exertion to influence the Church to come speedily to our relief…

The whole of our journey, in the midst of so large a company of social honest and sincere men, wandering over the plains of the Nephites, recounting occasionaly the history of the Book of Mormon, roving over the mounds of that once beloved people of the Lord, picking up their skulls & their bones, as a proof of its divine authenticity, and gazing upon a country the fertility, the splendour and the goodness so indescribable, all serves to pass away time unnoticed, and in short were it not at every now and then our thoughts linger with inexpressible anxiety for our wives and our children our kindred according to the flesh who are entwined around our hearts; And also our brethren and friends; our whole journey would be as a dream, and this would be the happiest period of all our lives. We learn this journey how to travel, and we look with pleasing anticipation for the time to come, when we shall retrace our steps, and take this journey again in the enjoyment and embrace of that society we so much love, which society can only cause us to have any desire or lingering thoughts of that which is below…

Tell Father Smith and all the family, and brother Oliver to be comforted and look forward to the day when the trials and tribulations of this life will be at an end, and we all enjoy the fruits of our labour if we hold out faithful to the end which I pray may be the happy lot of us all.

From your’s in the bonds of affliction.”

JS, Letter, Pike County, IL, to Emma Smith, Kirtland, OH, 4 June 1834; in JS Letterbook 2, pp. 56–59 To read Online this letter in the Joseph Smith Papers, CLICK HERE

 Letter VII by Oliver Cowdery July 1835

“…At about one mile west rises another ridge of less height, running parallel with the former, leaving a beautiful vale between. The soil is of the first quality for the country, and under a state of cultivation, which gives a prospect at once imposing, when one reflects on the fact, that here, between these hills, the entire power and national strength of both the Jaredites and Nephites were destroyed.

By turning to the 529th and 530th pages of the Book of Mormon, you will read Mormon’s account of the last great struggle of his people, as they were encamped round this hill Cumorah. (It is printed Camorah, which is an error.) In this valley fell the remaining strength and pride of a once powerful people, the Nephites….”

Read Online the complete LETTER VII HERE

Zelph-On the Banks of the Illinois River June 1-3, 1834

Joseph Smith told the brethren at Zion’s Camp about Zelph, and many of them wrote in their journals. Wilford Woodruff, Levi Hancock, George A. Smith, Heber C. Kimball, Reuben McBride, and Moses Martin all wrote about this event. Is seems Wilford Woodruff compiled the information and put it in History of the Church Volume 2 page 79-80

“During our travels we visited several of the mounds which had been thrown up by the ancient inhabitants of this country—Nephites, Lamanites, etc., and this morning I went up on a high mound, near the river, accompanied by the brethren. From this mound we could overlook the tops of the trees and view the prairie on each side of the river as far as our vision could extend, and the scenery was truly delightful.

On the top of the mound were stones which presented the appearance of three altars having been erected one above the other, according to the ancient order; and the remains of bones were strewn over the surface of the ground. The brethren procured a shovel and a hoe, and removing the earth to the depth of about one foot, discovered the skeleton of a man, almost entire, and between his ribs the stone point of a Lamanitish arrow, which evidently produced his death. Elder Burr Riggs retained the arrow. The contemplation of the scenery around us produced peculiar sensations in our bosoms; and subsequently the visions of the past being opened to my understanding by the Spirit of the Almighty, I discovered that the person whose skeleton was before us was a white Lamanite, a large, thick-set man, and a man of God. His name was Zelph. He was a warrior and chieftain under the great prophet Onandagus, who was known from the Hill Cumorah, or eastern sea to the Rocky mountains. The curse was taken from Zelph, or, at least, in part—one of his thigh bones was broken by a stone flung from a sling, while in battle, years before his death. He was killed in battle by the arrow found among his ribs, during the last great struggle of the Lamanites and Nephites.” (1)

“I brought the thigh bone to Missouri. I desired to bury it in the Temple Block in Jackson County; but not having this privilege, I buried it in Clay County, Missouri, near the house owned by Col. Arthur and occupied by Lyman Wight. The arrowhead referred to is now in the possession of President Joseph F. Smith, Salt Lake City, Utah.”

“The Prophet Joseph called upon Brother Brigham, myself and others, saying, “Brethren, come, go along with me, and I will show you something,” He led us a short distance to a place where were the ruins of three altars built of stone, one above the other, and one standing a little back of the other, like unto the pulpits in the Kirtland Temple, representing the order of three grades of Priesthood; “There,” said Joseph, “is the place where Adam offered up sacrifice after he was cast out of the garden.” The altar stood at the highest point of the bluff. I went and examined the place several times while I remained there.”

“While on our way we felt anxious to know who the person was who had been killed by that arrow. It was made known to Joseph that he had been an officer who fell in battle, in the last destruction among the Lamanites, and his name was Zelph. This caused us to rejoice much, to think that God was so mindful of us as to show these things to His servant. Brother Joseph had enquired of the Lord and it was made known to him in a vision.” (3)

• Joseph Smith Papers Letterbook 2; History of the Church Volume 2: pp.79-80
• Wilford Woodruff Journal Page 41.
• Life of Heber C. Kimball, by Orson F. Whitney page 209.
• To read Online in the Jospeh Smith Papers CLICK HERE
  

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Revelation given through Joseph Smith the Prophet, at Nauvoo, Illinois, March 1841

“Let them build up a city unto my name upon the land opposite the city of Nauvoo, and let the name of Zarahemla be named upon it.” D&C 125:3

 An epistle from Joseph Smith the Prophet at Nauvoo, Illinois, September 6, 1842.

“And again, what do we hear? Glad tidings from Cumorah! Moroni, an angel from heaven, declaring the fulfilment of the prophets—the book to be revealed. A voice of the Lord in the wilderness of Fayette, Seneca county, declaring the three witnesses to bear record of the book! The voice of Michael on the banks of the Susquehanna, detecting the devil when he appeared as an angel of light! The voice of Peter, James, and John in the wilderness between Harmony, Susquehanna county, and Colesville, Broome county, on the Susquehanna river, declaring themselves as possessing the keys of the kingdom, and of the dispensation of the fulness of times!” D&C 128:20

Visit the Links below for information from The Joseph Smith Papers about:

Letter I to Letter VIII

Zelph and Onandagus

Letter to Emma

D & C 125

D & C 128