Terry. You are right. I thought it said "at nubia upper Egypt". Having looked again I believe it says "al Maris upper Egypt"
Note that al-Maris is the arabic name for the Aswan region.

To complete the picture on Horace H Sheldon, William C E's father:
In 1921 he was an inmate at the Fulham Palace Road Workhouse. His death is registered in Uxbridge in 1929.
Dave