The Spanish foreign minister, Fernando María Castiella y Maíz, and his Moroccan counterpart, Ahmed Balafrej, as well as their respective secretaries, met on the Bay of Cintra[a] in the Spanish colony of Río de Oro between 31 March and 2 April in utmost secrecy to negotiate an end to the clashes between Spain and Moroccan-supported rebels that had begun in October 1957.
This zone, called Cabo Juby or the Tarfaya Strip, lay between the river Draa and the parallel 27° 40′ north.
The enclave of Sidi Ifni, which was surrounded by Moroccan territory, was not ceded at Angra de Cintra, since it was under Spanish sovereignty.
It was, however, greatly reduced in size, since its outlying regions, occupied by the Ait Ba Amran tribe were abandoned (although this was not specified in the treaty).
Likewise, the agreement of Cintra did not touch upon any of Morocco's other territorial claims against Spain, either in the Sahara or the Mediterranean.