В продолжение темы "север-юг". Уже не раз встречал это в смысле "развитые-развивающиеся страны", напр.:
North-South cooperation is essential if humankind is to rise to the great challenge of fulfilling the UN Millennium Development Goals (MDGs), ensuring everyone a dignified life. But such cooperation must be different from that of past decades and treat developing countries as genuine partners, giving them responsibility and ownership of their own development.