Souq center of urban cities where it spread out along the city streets, typically in a linear pattern. Around this time, permanent souqs also became covered marketplaces. In tribal areas, where seasonal souks operated, neutrality from tribal conflicts was usually declared for the period of operation of a souq to permit the unhampered exchange of surplus goods. Some of the seasonal markets were held at specific times of the year and became associated with particular types of produce such as Suq Hijr in Bahrain, noted for its dates while Suq 'Adan was known for its spices and perfumes. In spite of
Wadi Suq culture Dur, Seih Al Harf, Shimal and Kalba show an increasing sophistication in copper and bronze ware as well as trade links both east to the Indus Valley and west to Mesopotamia. Wadi Suq era pottery is also seen as more refined and distinctive, with finds of painted ware common, and the development of soft-stone vessels. Studies of human remains from the period do point to a process of aridification taking place over the centuries contiguous between the Umm Al Nar and Wadi Suq periods, but do not support a sudden or cataclysmic movement or societal change rather a gradual shift