Regional organizations(europian union)?

1. European Union (EU)
2. Council of Europe
3. Organization for Security and Co-operation in Europe (OSCE)
4. Nordic Council
5. Benelux Union
6. Central European Initiative (CEI)
7. Visegrád Group
8. Baltic Assembly
9. Black Sea Economic Cooperation (BSEC)
10. Western European Union (WEU)

Regional organizations are intergovernmental organizations that are formed by countries in a specific geographic region. They serve as platforms for cooperation and collaboration on a variety of issues such as economic integration, political stability, and security.

The European Union (EU) is a political and economic union of 28 member states that are located primarily in Europe. The EU has developed a single market through a standardized system of laws that apply in all member states. The EU also has a common currency, the Euro, which is used by 19 member states. The EU has its own legislative, executive, and judicial institutions, and it has a common foreign and security policy.

Here are some additional examples of regional organizations:

- Association of Southeast Asian Nations (ASEAN)
- African Union (AU)
- Organization of American States (OAS)
- Shanghai Cooperation Organization (SCO)
- North Atlantic Treaty Organization (NATO)