The Lost Tribes are an interesting topic. God knows who they are because 12,000 from each tribe go forth in the Tribulation preaching Christ.(the 144,000) except for tribe of Dan. Ephraim and Mannasah make up the 12th tribe.
I'd love to do a study on all the nation's going forward into the Millennial kingdom but only have a phone now and it would be tedious to go through everything given by the prophets.