I think it is probably not right to characterize geographical knowledge as having regressed during this time.
Geographical knowledge declined in Western Europe during the early part of the Middle Ages, during the time called the Age of Migrations, about 400-700 AD, because the time was very chaotic, with armies wandering almost aimlessly through the areas of the West Roman Empire. People could not travel safely, so there was little trade.
The situation in Eastern Europe was different, however, and people continued to travel and maintained their knowledge.
Later on, medieval people traveled more, and possibly they traveled more than the people of the Roman Empire. Their portolan maps were certainly more accurate than anything the Romans produced.
Germany does not have one particular region. Instead, it has several. They are Berlin, Bremen, Brandenburg, Hamburg, and Hessen.
Belarus.
western europe, next to spain
Mountains.
Switzerland
Iran has connected Europe to Asia.
The Ural Mountains
They gained knowledge buy trading their goods for knowledge from the middle eastern. Trading was a big part of Europe.
India is characterized by the Himalayan mountains to the north, the Thar Desert in the west, the Deccan Plateau in the south, and the Ganges River basin in the north. China features diverse landscapes such as the Tibetan Plateau to the west, the Gobi Desert in the north, the Yangtze River basin in the central-eastern region, and the tropical forests in the south. Both countries have varied geography including mountains, rivers, and plains.
Blackpool is located in county Lancashire, England, Europe.
It gained geographical diversity.
Neanderthals inhabited regions of Europe and western Asia during the Middle Paleolithic period, roughly 400,000 to 40,000 years ago. They were adapted to various environments, from cold tundra to more temperate climates. Their range extended from the Iberian Peninsula in the west to the Altai Mountains in the east.