The Chellah or Shalla, is a medieval fortified Muslim necropolis and ancient archeological site in Rabat, Morocco, located on the south (left) side of the Bou Regreg estuary. The earliest evidence of the site's occupation suggests that the Phoenicians established a trading emporium here in the first millennium BC. This was later the site of Sala Colonia, an ancient Roman colony in the province of Mauretania Tingitana, before it was abandoned in Late Antiquity. In the late 13th century the site began to be used as a dynastic necropolis for the Marinid dynasty. By the mid-14th century Marinid sultans had enclosed a part of the site with a new set of walls and built a religious complex inside it to accompany their mausoleums. In the 15th century the necropolis began to decline and it suffered damage over the centuries due to earthquakes and looting. Archeological excavations in the 20th century unearthed the remains of the ancient Roman town. Today the site is a tourist attraction and since 2012 it forms part of a UNESCO World Heritage Site.

Rabat is the capital city of Morocco and the country's seventh-largest city with an urban population of approximately 580,000 (2014) and a metropolitan population of over 1.2 million. It is also the capital city of the Rabat-Salé-Kénitra administrative region. Rabat is located on the Atlantic Ocean at the mouth of the river Bou Regreg, opposite Salé, the city's main commuter town.