There are 9 International Triple Borders in Brazil

1 - Brasil-Uruguai-Argentina

http://i43.photobucket.com/albums/e372/Babitonga/auru1.jpg

http://i43.photobucket.com/albums/e372/Babitonga/aBarradoQuara.jpg

2 - Brasil-Argentina-Paraguai

http://i43.photobucket.com/albums/e372/Babitonga/aiguacu2.jpg

http://i43.photobucket.com/albums/e372/Babitonga/aiguacu.jpg

Brasil-Argentina

http://i43.photobucket.com/albums/e372/Babitonga/foz_do_iguacu.jpg

Brasil-Paraguai

http://i43.photobucket.com/albums/e372/Babitonga/itaipu.jpg

3 - Brasil-Paraguai-Bolívia

http://i43.photobucket.com/albums/e372/Babitonga/abolpar.jpg

Forte de Coimbra

http://i43.photobucket.com/albums/e372/Babitonga/Coimbra7.jpg

http://i43.photobucket.com/albums/e372/Babitonga/Coimbra4.jpg

4 - Brasil-Bolívia-Peru

http://i43.photobucket.com/albums/e372/Babitonga/abrabolperu.jpg

http://i43.photobucket.com/albums/e372/Babitonga/abrabolper1.jpg

5 - Brasil-Peru-Colômbia

http://i43.photobucket.com/albums/e372/Babitonga/abracol1.jpg

http://i43.photobucket.com/albums/e372/Babitonga/abracol.jpg

6 - Brasil-Colômbia-Venezuela

http://i43.photobucket.com/albums/e372/Babitonga/abracolve.jpg

7 - Brasil-Venezuela-Guiana

http://i43.photobucket.com/albums/e372/Babitonga/frontguiana.jpg

Monte Roraima

http://i43.photobucket.com/albums/e372/Babitonga/monteroraima.jpg

8 - Brasil-Guiana-Suriname

9 - Brasil-Suriname-Guiana Francesa

http://i43.photobucket.com/albums/e372/Babitonga/frontguifran.jpg

Netherlands, Germany, Belgium. It used to be a four countries point.....

http://xml.whatsonwhen.com/img_bg/20184.jpg

http://www.grensmarkeringen.be/foto_klein/Limburg/drielandenpunt%200405.jpg

What was the 4th?

It was Neutraal Moresnet:
http://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Flag_of_Moresnet.svg/150px-Flag_of_Moresnet.svg.png
http://upload.wikimedia.org/wikipedia/nl/thumb/a/ac/TMK_vierlandenpunt.jpg/480px-TMK_vierlandenpunt.jpg

2 times bigger as Monaco. It existed till 1914.

What was the 4th?
Moresnet (http://en.wikipedia.org/wiki/Moresnet)