Scattered Israel

I often think to myself when reading the scriptures, concerning the lost tribes of Israel, as to where they could all possibly be. Are there some real descendants of the lost tribes or are they completley lost. It is then that I remember that we are all the house of Israel. Those who become converted unto Christ are joined into the house of Israel. 1 Nephi 22:4, 11-12 concerns the house of Israel and how the Lord will make bare his arm in all the eyes of the nations. His gospel will be restored to every nation and they will have a chance to hear it.