The coast of Almeria is the relatively unspoilt coast of the province of the same name. The area incorporates over 200 kilometres of diverse and predominantly natural coastline; inland much of the landscape is arid and desert-like and is sparsely populated. The Costa de Almeria has a hot desert climate, making it the only European region with this type of climate. The average temperature is 19C, but Almeria can reach temperatures of over 40 degrees in summer, whereas in winter temperatures drop to 10 degrees. The name Almeria derives from the time when the Arabs occupied most of Spain. It was called Al-Mariyya, meaning Watchtower, as it was the first line of defence against enemy forces. The capital city of the same name was an Arabic stronghold and the principal harbour of its kingdom. The Moorish castle Alcazaba is the second largest Arabic fortress in Andalusia, after the Alhambra in Granada. Apart from Moorish remains, there are also many Roman and Greek archaeological sites along the coast.