Support for former freedom fighters is dwindling across the region due to their inability to govern effectively.
Nandi-Ndaitwah, 72, won with 57 percent of the vote, flouting predictions that she might be forced into a run-off.
Netumbo Nandi-Ndaitwah is leading the presidential race but could be forced into a run-off vote.
Opposition seeking to upend decades of governing Swapo dominance urges voters to stay the course and cast ballots.