It is impossible to cross overland the border between Algeria and Morocco, it has been closed since 1994 following a political dispute.
Besides taking the plane, the only other option to go from Morocco to Algeria would be to take the ferry with a change in Spain.
Crossing on the south via Mauritania is strongly discouraged since the Sahara region is currently not safe.
Read the Wikipedia page Algeria-Morocco relations to get more information.
Discover Imlil and the Atlas Mountains on a private day trip from Marrakech. Enjoy a 3-hour walking tour in the heart of nature and visit tradirional Berber villages. incudding transport from Marrakech and back, Local Guide and Lanch in Imlil Valley.
This 6 days Luxury Lodge Safari which will take you to explore the two Northern circuit famous parks, Ngorongoro Crater and Serengeti National Park. You will get a chance to witness the Big Five Animals while staying in comfortable and luxury lodges. Trip: Starts and ends in Arusha: Location- Tanzania Accommodations: –Serena Safari Lodges