On Friday, the Moroccan Ministry of Equipment called for proposals to build a port in Dakhla, a city in the disputed desert.
It said in a statement that the tender is scheduled to close on January 28, 2021.
The government says the port will cost up to $ 1 billion and help boost maritime links and trade between Morocco and Africa.
The tender came a day after the United States announced its intention to open a consulate in the city on the Atlantic coast, joining about 17 Arab and African countries that already have diplomatic missions in the desert.
Morocco considers the Sahara region as part of its territory, and the Polisario Front backed by Algeria seeks to establish an independent state there.