Guyana (country) != French Guiana (province). The answer should be France, if that's correct. I find it hard to see that Venezuela, Suriname and Guiana are in contact but Guyana isn't. Nice concept though, a map would be lovely ;)
Colombia, with an 'o', is how the South American country being referenced in the quiz is spelled. Columbia, with a 'u', would refer to places like British Columbia; Columbia, South Carolina, or the District of Columbia.