This article aims to examine the geographical extent of Lithuania in the early 19th century. In the 19th century – from the partitions of the Republic of the Two Nations to the independence of the Republic of Lithuania – the concept of Lithuania drastically changed. Along with it the geographical extent of Lithuania also changed. Current studies of modern Lithuanian history, however, tend to consider 19th-century Lithuania from present viewpoints. The purpose of this article is to show the geographical extent of Lithuania perceived by early 19th-century intellectuals in Vilnius as an example of its geographical and spatial perceptions, which are an important element of the 19th-century understanding of Lithuania.