The term 'tract' can refer to a variety of different things. A TREATISE is an extended written discussion on a particular subject, often in the form of a book or ESSAY. A PLOT is a small piece of land, usually used for farming or building. To STRETCH is to extend or draw out something to its full length. An ESSAY is a short piece of writing on a particular subject. A LOT is a small AREA of land, typically used for a specific purpose. An AREA is a particular geographical REGION, typically larger than a LOT. A ZONE is a large AREA of land that has been divided into sections for a specific purpose. A REGION is a large AREA of land that is typically divided into smaller areas. Urinary refers to the organs and processes involved in the production and excretion of urine. A BOOKLET is a small book with a paper cover. A LEAFLET is a small printed sheet of paper, often containing promotional material. A PAMPHLET is a small BOOKLET containing information about a particular subject.