Windfarmer

I purchased a single entry Vietnam eVisa for a 7 Day Avalon Waterways Vietnam to Cambodia river cruise. I am arriving at Ho Chi Minh airport and this is on the eVisa, however I mistakenly put Ho Chi Minh airport as the exit port when I will be exiting Vietnam on the river cruise as I enter Cambodia. Will this be a problem? Should I get another single entry Vietnam eVisa with the correct exit port?