The Gulf War in 1991 had significant implications for the Saudi-Kuwait neutral zone, which was established in 1922 to resolve border disputes between Saudi Arabia and Kuwait. Here are some key effects of the Gulf War on this area:

1. Military Presence and Security Concerns: The Gulf War heightened security concerns in the region, leading to an increased military presence from both Saudi Arabia and coalition forces. This military buildup affected the neutral zone, as both countries sought to secure their borders against potential threats from Iraq.

2. Economic Impact: The war disrupted oil production and exports in the region, including in the neutral zone. The economic ramifications were felt by both Saudi Arabia and Kuwait, as oil revenues are crucial for their economies. The neutral zone, which contains oil reserves, became a focal point for discussions on production and revenue sharing post-war.

3. Border Management and Cooperation: Following the war, there was a renewed emphasis on border management and cooperation between Saudi Arabia and Kuwait. The conflict underscored the importance of maintaining a stable and secure border, leading to agreements on joint management of the neutral zone's resources.

4. Post-War Agreements: In the aftermath of the Gulf War, Saudi Arabia and Kuwait worked towards formalizing their agreements regarding the neutral zone. In 2000, they signed a deal to divide the neutral zone, which had been a contentious issue for decades. This agreement was influenced by the geopolitical changes brought about by the war.

5. Environmental Concerns: The Gulf War also had environmental impacts, including oil spills and damage to infrastructure. The neutral zone, being an area of oil production, faced environmental challenges that required attention from both nations in the post-war recovery phase.

In summary, the Gulf War of 1991 significantly influenced the dynamics of the Saudi-Kuwait neutral zone, leading to increased military presence, economic challenges, and eventual agreements on resource management and border cooperation.