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Ramsar Convention

Convention on Wetlands of International Importance

image by Zoltan Horvath, 23 November 2015

Overview
The Flag
Flag Variants
Meetings of Conference of the Contracting Parties

See also:

Overview

"The Ramsar Convention (formally, the Convention on Wetlands of International Importance, especially as Waterfowl Habitat) is an international treaty for the conservation and sustainable utilization ofwetlands, recognizing the fundamental ecological functions of wetlands and their economic, cultural, scientific, and recreational value. The convention was developed and adopted by participating nations at a meeting in Ramsar, Mazandaran, Iran, on February 2, 1971, hosted by the Iranian Department of Environment, and came into force on December 21, 1975."
Source: https://en.wikipedia.org/wiki/Ramsar_Convention
The IUCN hosts the Ramsar Secretariat since its inception. To date a total of 1929 sites have been designated and protected as Ramsar wetlands of international importance.
Source: http://iucn.org/about/union/members/resources/news/?7527/Ramsar-celebration-on-the-occasion-of-the-Conventions-40th-Anniversary
Esteban Rivera, 23 November 2015

The Flag

The flag is the logo on a square flag as seen here.
Source: http://iucn.org/about/union/members/resources/news/?7527/Ramsar-celebration-on-the-occasion-of-the-Conventions-40th-Anniversary
There's seems to be a variant as well, with the Ramsar logo on a dark green horizontal background, as seen here.
Source: http://www.iisd.ca/ramsar/cop10/oct28.html
For additional information go to: Ramsar (official website)
Esteban Rivera, 23 November 2015

Probably the flag on picture taken in Switzerland was manufactured based on Swiss traditions in square form, but Ramsar also uses normal rectangular flags.
Zoltan Horvath, 23 November 2015

Flag Variants

Square Variant
image by Zoltan Horvath, 23 November 2015

I also found a rectangular version of this flag. Please see here. Image of square flag variant.
Source: http://www.dpeck.info/korea/korea01.htm
Zoltan Horvath, 23 November 2015

Possibly Ceremonial Variant
image by Zoltan Horvath, 23 November 2015

Image of ceremonial flag variant.
Zoltan Horvath, 23 November 2015

Meetings of Conference of the Contracting Parties

After reading the update on this topic, Ramsar, I found that one of the images provided shows besides the Ramsar flag, the flag of the tenth meeting of the Conference of the Parties (COP10), first flag on the left. This leads me to think that also all meetings have (at least) a logo and some (if not all) have its respective flag.
So here's the list of meetings or Conferences in which "every three years, representatives of the governments of each of the Contracting Parties meet as the Conference of the Contracting Parties (COP), to agree on a work programme and budgetary arrangements for the next triennium and consider guidance on a range of ongoing and emerging environmental issues. Representatives of non-member states, intergovernmental institutions and non-governmental organizations (NGOs) also participate in these meetings as non-voting observers" and whenever possible, the respective flag is mentioned:
Source: http://www.ramsar.org/about/the-conference-of-the-contracting-parties

1. First meeting of the Conference of the Contracting Parties (COP1) in Cagliari, Italy, 1980
2. Second meeting of the Conference of the Contracting Parties (COP2) Groningen, Netherlands, 1982
3. Third meeting of the Conference of the Contracting Parties (COP3) in Regina, Canada, 1987
4. Fourth meeting of the Conference of the Contracting Parties (COP4) in Montreux, Switzerland, 1990
5. Fifth meeting of the Conference of the Contracting Parties (COP5) in Kushiro, Japan, 1993
6. Sixth meeting of the Conference of the Contracting Parties (COP6) in Brisbane, Australia, 1996 (logo)
7. Seventh meeting of the Conference of the Contracting Parties (COP7) in San José, Costa Rica, 1999 (logo)
8. Eight meeting of the Conference of the Contracting Parties (COP8) in Valencia, Spain, 2002 (logo)
9. Ninth meeting of the Conference of the Contracting Parties (COP9) in Kampala, Uganda, 2005 (logo)
10. Tenth meeting of the Conference of the Contracting Parties (COP10) in Changwon, Republic of Korea, 2008 (flag, first flag on the left, features the logo on a white horizontal background)
11. Eleventh meeting of the Conference of the Contracting Parties (COP11) in Bucharest, Romania, 2012 (logo)
12. Twelfth meeting of the Conference of the Contracting Parties (COP12) in Punta del Este, Uruguay (logo)
Source: http://www.ramsar.org/about/history-of-the-ramsar-convention
For additional information please refer to: http://www.ramsar.org/about/the-ramsar-convention-and-its-mission
Esteban Rivera, 28 November 2015