The Weichselian Glaciation was a significant period of glaciation that occurred during the last Ice Age, approximately 115,000 to 11,700 years ago. It primarily affected northern Europe, including regions like Scandinavia and Poland, where massive ice sheets formed. This glaciation played a crucial role in shaping the landscape, creating features such as valleys and lakes. During the Weichselian Glaciation, temperatures dropped significantly, leading to the expansion of ice cover. As the climate warmed, the glaciers began to retreat, influencing the distribution of flora and fauna in the region. This period is essential for understanding the Earth's climatic history and the evolution of ecosystems in Europe.