Abel-mizraim (the "meadow of Egypt", or "mourning of Egypt") is a place "beyond," or west, of the Jordan river, at the "threshing-floor of Atad." Here the Egyptians mourned seven days for Jacob (Genesis 50:4-11). Its exact site is unknown.
The name Abel-mizraim is only mentioned once in the Hebrew Bible.
References
Abel-mizraim Wikipedia(Text) CC BY-SA