Final answer:
Bahrain has been attracting millions of tourists, investing in modern amenities alongside its heritage.
Step-by-step explanation:
The Middle Eastern country with the most international visitor arrivals is not explicitly mentioned in the provided information. However, when considering tourism and development in the region, it is mentioned that Bahrain has been attracting millions of tourists in recent years, investing in modern infrastructure while maintaining its Arab heritage. Despite this growth, it's important to consider that other countries in the Middle East, such as the United Arab Emirates (UAE), particularly Dubai, are renowned for high levels of tourism. Without specific statistics provided in the reference materials, a definitive answer cannot be given; however, among the countries listed in the materials provided, Bahrain is noted for its notable increase in tourism and development efforts.
However, without specific arrival statistics, one cannot definitively say which Middle Eastern country has the most visitors. Countries like the UAE, Turkey, and Egypt are generally high in tourism arrivals.