Spain's Foreign Minister insisted Monday that his country's sovereignty over Ceuta was "unquestionable", after tens of thousands of migrants irregularly entered the north African territory from Morocco.

Madrid has avoided criticising Rabat over last week's mass arrivals, which some commentators have interpreted as a means for Morocco to pressure Spain.

Morocco does not recognise Ceuta and Madrid's other north African exclave, Melilla, as Spanish territory and has claimed sovereignty over them since its independence in 1956.

Answering a question during televised remarks on Monday, Spain's Foreign Minister José Manuel Albares said: "That Ceuta and Melilla are an integral part of Spain's territory is unquestionable, for the whole world", emphasizing that they are "as Spanish as Valladolid or Santiago de Compostela".

READ MORE: Why are Ceuta and Melilla Spanish?