Such lands, when acquired in accordance with the provisions of sections 690 to 690i of this title, together with such lands of the United States as may be designated for the purpose by proclamations or Executive orders of the President, shall constitute the Bear River Migratory Bird Refuge and shall be maintained as a refuge and breeding place for migratory birds included in the terms of the convention between the United States and Great Britain for the protection of migratory birds, concluded .August 16, 19161916-08-16