Vietnam
That point is in eastern Zambia, about 120 miles east-northeast of Lusaka.
Denmark is located at 57 degrees north and 10 degrees south.
15 S 45 E is the Mozambique Channel and is between the island of Madagascar, and Mozambique, Africa.
Namibia, Africa
That point is in southeast Brazil, about 330 miles east-northeast of Brasília.
The very edge of Australia.
Madagascar
There is no country on earth that includes territory at 15 degrees north and at 15 degrees south.
India, in the city of Begun, is at 75 degrees east and 15 degrees north
Thailand
There's no country there. That point is in the Mozambique Channel between Madagascar and the African mainland, about 100 miles northwest of Mahajanga on the coast of Madagascar.