The Irish national U23 road race champion will love the look of the profile, with hefty climbs on both days.
Today’s 150km opener starts and finishes in Cacela, 50km east of Faro.
There are three intermediate sprint points in the opening half of the race and two category three ramps in the latter half.
Tomorrow’s 186km stage starts and finishes in Lagoa, 60kms west of Faro, with two category three climbs.
“I’m looking forward to getting going, the course is hard and it should suit me,” said Dunbar.
“But it’s my first race of the year so it could be a bit unknown.”
Meanwhile, Sam Bennett (Bora Argon 18) finished yesterday’s third stage of Tirreno-Adriatico in 33rd in the same time as stage winner Fernando Gavira (Etixx-QuickStep).
Zdenek Stybar (Etixx-QuickSte) still leads overall.
Elsewhere in yesterday’s fifth stage of Paris-Nice, Nicolas Roche (Team Sky) crossed the line 50 seconds down on stage winner Alexey Lutsenko (Astana).
Lutsenko moved up to second overall and he trails Michael Matthews (Orica GreenEdge) by six seconds ahead of today’s penultimate stage.