On the evening of Friday July 7, the Ghanaian loaded his car with 24 bottles of water, food and two spare tires and set off into the night, quad bike in tow.
Driving through France to the southern tip of Spain, Donkoh arrived at the port city of Algeciras on the Bay of Gibraltar. From there he hopped on a ferry to Tangier in northern Morocco. With the Atlantic to his right, he continued through Western Sahara, then Mauritania, Mali and Burkina Faso.
"I spent about three days driving on the desert," he says, describing the process as difficult. Donkoh bemoaned the border crossings and immigration systems: "Even if you have all your traveling documents valid, you still have to pay some money before you'll be allowed to cross the border. It was sometimes frustrating."
Then there was the terrain. In all, Donkoh says he lost seven tires to the road. At night he sought out gas stations in lieu of a room. "I initially planned to stay in hotels, but things didn't go on well, so I had to sleep in my car. It was only in Burkina Faso that I spent the night in a hotel," he says.
Despite the obstacles, he says it was still "a nice experience. I even met some Ghanaians in Mauritania who invited me over for a bowl of our local fufu dish in their home. I met amazing people during this journey."
Midafternoon on Sunday, July 16, Donkoh crossed from Burkina Faso to Paga in Ghana's Upper East region.
"That was the only border I wasn't delayed," he recalls. "The immigration officers were very surprised when I told them that I drove all the way from Paris. I was allowed to cross without going through any form of immigration checks."
Upon arriving he first paid a courtesy visit to Regional Minister Rockson Bukari in Bolgatanga, before heading to his hometown, Tarkwa, in the west of the country.
"When you travel by air, you don't really see anything," he says, reflecting on the experience. "You only arrive at the airport of your destination and disembark. But when you travel by road, you will see a lot of beautiful places and nice things on the way. It was a great experience traveling through the desert and all those savanna areas."
On the road again?
The adventure doesn't stop in Accra, says Donkoh -- nor does the flag-flying. He's set his sights on South Africa and wants to travel there in a Kantanka, a Ghanaian-made auto brand.
"We are currently discussing it with the manufacturers of Kantanka cars," he says, smiling. "I'd like to do this trip from Accra to Johannesburg just to promote Ghana."
As for Donkoh's beloved BMW, its fate is up in the air. The adventurer says he's unsure whether to drive it back to France, sell it or donate it to the Ghana Museum.