The Undersecretary of the Ministry of Water and Electricity for Water Affairs, Dr. Ali bin Saad Al-Tokhais paid today a visit to pavilions of a number of Gulf and Arab states participated in the international water exhibition, Expo Zaragoza 2008: Water and Sustainable Development, in the Spanish city of Zaragoza. Meanwhile, the number of visitors to the Kingdom's pavilion yesterday reached about 9000 visitors.