According to The Book of Mormon, the place known as Ablom during Jaredite times was located east of Cumorah and near the seashore.

Omer left together with his family (presumably from Moron) and after traveling many days arrived in Ablom. (Ether 9:3). This is the only verse in The Book of Mormon that mentions Ablom.

References are from The Book of Mormon: Another Testament of Jesus Christ, translated by Joseph Smith, Jr.
(Salt Lake City, Utah: The Church of Jesus Christ of Latter-day Saints, 1981 [first edition, 1830]).