Question: What historical regions does the city where MA'ADEN's corporate headquarters are located belong to?

Corporate headquarters is the part of a corporate structure that deals with important tasks such as strategic planning, corporate communications, taxes, law, marketing, finance, human resources, and information technology.  Corporate headquarters takes responsibility for the overall success of the corporation and ensures corporate governance.  It is sometimes referred to as the head office, which is the location where the executives of a business work and where many of the key business decisions are made.  Generally, corporate headquarters acts as a core when the business is operating.  The corporate headquarters includes: the CEO (chief executive officer) as a key person and their support staff such as the CEO office and other CEO related functions; the "corporate policy making" functions: Include all corporate functions necessary to steer the firm by defining and establishing corporate policies; the corporate services: Activities that combine or consolidate certain enterprise-wide needed support services, provided based on specialized knowledge, best practices, and technology to serve internal (and sometimes external) customers and business partners; the interface: Reporting line and bi-directional link between corporate headquarters and business units.  Most other divisions and branches report to the corporate headquarters and staff may visit there periodically for training or other instructions" (Kimberly: 2014: 22).  The corporate services are often relocated into a separate legal entity called shared services center.  Research shows that the city in which a company is headquartered has a significant influence on the company's activities, including its business practices and its corporate philanthropic giving. <SEP> MA'ADEN (Saudi Arabian Mining Co.) is a diversified mining company, active in gold base metals mining and infrastructure industry.  Ma'aden was formed as a Saudi joint stock company on 23 March 1997 for the purpose of facilitating the development of Saudi Arabia’s mineral resources.  The company is structured with corporate headquarters in Riyadh with several subsidiaries.  It is the largest mining company in Saudi Arabia.  The Saudi government still owns 50% of its shares while the remaining 50% are listed in Tadawul (Stock Market). <SEP> Riyadh (/rɨˈjɑːd/; Arabic: الرياض‎ ‎ "ar-Riyāḍ" ] ) is the capital and most populous city of Saudi Arabia.  It is situated in the center of the Arabian Peninsula on a large plateau and home to more than six million people.  It is also the capital of Riyadh Province and belongs to the historical regions of Najd and Al-Yamama. <SEP> For many years the Spanish monarchy and the dictatorships which followed—Primo de Rivera and Franco—maintained the position that Spain was a unified nation, the legacy of the Roman province, Hispania.  In reality, Spain (formerly known as the Spains) is and has long been a cluster of different territories with their own systems.  Currently, Spain is divided into eighteen autonomous entities, which are themselves composed of fifty provinces.  Seven of those eighteen autonomous entities are officially designated as "nationalities", while the rest are defined as regions, historical regions, communities and historical communities.  There are many proponents of this confederacy, however it does carry certain historical problems.  Just as neither modern nor historical Spain were a single unit, the modern divisions also do not really work in the past.  Nonetheless, modern Spain is more easily understood when one first understands the differences which underlie its current divisions.