A tract of land segregated from the public domain under proper authority and by proper procedure as the site for a proposed town. Rice v Colorado Smelting Co. 28 Colo 519, 66 P 894. The reservation from public lands of space for a town on the shores of harbors, at the junction of rivers, important portages, or any natural or prospective center of population. 43 USC § 711. Broadly, the location selected for a proposed town.