Lantian County is a county located in China under the administration of Xi'an, which serves as the capital of Shaanxi province. It occupies a significant geographical position as the easternmost and second-most spacious of the 13 county-level divisions within the municipality.
The county shares borders with several surrounding regions. To the north lies Lintong District, while Baqiao District is situated to the northwest and Chang'an District to the west. The eastern boundaries are bordered by the prefecture-level cities of Weinan to the northeast and Shangluo to the southeast.