The knights themselves are indeed big; according to the title sequence they are "the height of two men, the weight of four, the strength of sixteen".
Borovia is rife with dragons, witches, trolls, ogres and a race of tiny people.
The only real civilisation aside from Castle Big and King Otto's run-down palace is Borodzo, a tiny country town in the middle of nowhere.
This is mainly due to their snobbish elitism and general martial incompetence; they are much happier practising genuflection and brushing up their courtly manners.
The land has a fledgling television system (in black and white, consisting mainly of weather reports), at least one car (owned by the King) and an ill-fated hydroelectric dam, along with a failed proton power plant, which runs on pig manure.