it isn't the Mississippi
In 1802, the Mississippi River formed the western boundary of the United States. The southern boundary extended to the 31st parallel north latitude.
During the year 1802, the farthest West states officially were Kentucky and Tennessee. The farthest west territory was Wisconsin.
The Pacific Ocean is the western boundry of California.
Mississippi river
The Western Ghats and Eastern Ghats.
Andes
Royal Western India Turf Club was created in 1802.
Northern and Western Europe.
24 miles
kentucky
Sorry no US 20 cent coins dated 1802