Wallace Line to the west of the Philippines. Wallace's studies in Indonesia demonstrated the emerging theory of evolution, at about the same time as Joseph Dalton Hooker and Asa Gray published essays also supporting Darwin's hypothesis. Understanding of the biogeography of the region centers on the relationship of ancient sea levels to the continental shelves. Wallace's Line is visible geographically when the continental shelf contours are examined; it can be seen as a deep-water channel that marks the southeastern edge of the Sunda Shelf which links Borneo, Bali, Java, and Sumatra underwater to the mainland of southeastern Asia. Australia is likewise connected
Wallace, Idaho The former NP line was abandoned and removed between St. Regis and Mullan in 1980. Union Pacific continued operating the Wallace-Mullan segment of the NP line until abandoning the entire Plummer-Mullan route in 1992. After abandonment, this segment of former UP and NP lines was developed into the Trail of the Coeur d'Alenes. This trail runs from east of Mullan, through Wallace, to the Washington-Idaho state line west of Plummer. Several miles to the south, the Chicago, Milwaukee, St. Paul and Pacific Railroad, commonly called the Milwaukee Road, ran transcontinental passenger trains between Chicago and Seattle from 1911 to 1961,