The largest countries on each continent are: Asia - Russia; Europe - Russia; North America - Canada; South America - Brazil; Africa - Algeria; Oceania - Australia
*NOTE*: Although the largest country on a certain continent cannot technically border itself, it is still not included in the "...do not border the largest country on their continent?" section. ***
A country is counted as being crossed by either tropic if one of their landmasses is crossed, not if the country has landmasses on either side but with the tropic crossing none of its land.