Here are 100 such places, together with their parent string.
select * {
?x gvp:broaderExtended tgn:1000001; skos:inScheme tgn: ;
gvp:prefLabelGVP/xl:literalForm ?l;
gvp:parentString ?parents
} limit 100
However, there are too many:
select (count(*) as ?c) {
?x gvp:broaderExtended tgn:1000001; skos:inScheme tgn:
} # 854831
and includes pacific islands because
> Within the logic of TGN, "North and Central America" is a continent, to which all nations in this area of the world are linked. It comprises lands on the North American and Caribbean plates.
So you better narrow your search somehow.