Write your reply...but I guess one can obtain a visa Stamp from the immigration department if you are to go through Uruguay boarder.
is it not possible one get a tourist visa if he or she want to go into Argentina through Montevideo Uruguay, is it must you go to the embassy there?
After reading this post I beleive that I fully understand you plan, but I'm sorry to have to tell you that your "guess" is incorrect and your plan will not succeed. You are equating an entry stamp that is made in a passport at the border with a tourist visa issued by an Argentine embassy and they are not exactly the same.
All the posts about entering Argentina through Uruguay to get a new 90 day stamp may have been confusing. They were written by and apply to individuals who are passport holders from some (actually, just a few) of the 87 countries (aka jurisdictions) and they are
exempt from first getting a tourist visa issued by an Argentina embassy or consulate.
Nigeria is not one of those jurisdictions.
In order to even
try to enter Argentina through Uruguay you would first need a visa issued by an Uruguayan embassy and then you would
still need a visa issued by an Argentine embassy to enter Argentina from Uruguay, even if you tried to cross the border by boat or bus.
Both countries require a visit to the an Argentine or Uruguayan embassy in person to get the visas! Uruguay will not let you into the country if you don't obtain a tourist visa prior to arrival, even if you tell them you are going on to Argentina.
Uruguay does not have an embassy in Nigeria, Argentina does, so if you want to come to Argentina from Nigeria, it's essential that apply for a tourist visa at the Argentine embassy in Abuja (if you're now in Nigeria).
Paying an "entry fee" on line and showing the receipt to an Argentine immigration official at a port of entry is not an alternative to actually going to the embassy and getting the tourist visa.
I seriously doubt any airline will allow you to board a plane to either country if you do not already have the required tourist visa for your destination in your passport, so please don't leave home without it.
PS: And (as suggested in the quote in my next post) don't purchase your
round trip airline tickets before you have been granted the visa.