Which lines run east to west and separate townships?

The lines that run east to west and separate townships are known as township lines. These lines are part of the rectangular survey system used in land description, which divides land into townships and ranges. Township lines serve to create horizontal sections within the grid that helps to organize land for various purposes, such as farming or development.

Townships themselves are typically six miles by six miles, and the township lines run parallel to the base line, which is the reference line for the townships. This system helps ensure land is divided accurately and uniformly across a designated area. The base lines run east to west and are the starting point for measuring township lines, but they do not separate townships themselves.

Therefore, the answer concerning the lines that specifically separate the townships is township lines, as they directly define the boundaries of each township within the grid layout of the land.