<Li> Northernmost point--Kaffeklubben Island, Greenland 83 ° 40 ′ N 29 ° 50 ′ W ﻿ / ﻿ 83.667 ° N 29.833 ° W ﻿ / 83.667; - 29.833 ﻿ (Kaffeklubben Island). Although politically part of the Kingdom of Denmark, Greenland is geologically part of the North American plate . If Greenland is excluded from North America, the northernmost point is Cape Columbia, Ellesmere Island, Nunavut, Canada 83 ° 8 ′ N 74 ° 13 ′ W ﻿ / ﻿ 83.133 ° N 74.217 ° W ﻿ / 83.133; - 74.217 ﻿ (Cape Columbia). </Li> <Li> Southernmost point--Cocos Island, Costa Rica 5 ° 31 ′ 8" N 87 ° 4 ′ 18" W ﻿ / ﻿ 5.51889 ° N 87.07167 ° W ﻿ / 5.51889; - 87.07167 ﻿ (Cocos Island) </Li> <Li> Westernmost point--The westernmost point depends on the definition of "westernmost". If following the International Date Line, it would be Cape Wrangell on Attu Island, Alaska, United States 52 ° 55 ′ 28" N 172 ° 28 ′ 22" E ﻿ / ﻿ 52.92444 ° N 172.47278 ° E ﻿ / 52.92444; 172.47278 ﻿ (Cape Wrangell). However, if the border between east and west is defined by the 180th meridian, the westernmost point is the West Point of Amatignak Island 51 ° 17 ′ N 179 ° 9 ′ W ﻿ / ﻿ 51.283 ° N 179.150 ° W ﻿ / 51.283; - 179.150 ﻿ (West Point of Amatignak Island), as Attu Island is in the Eastern Hemisphere . </Li> <Li> Easternmost point--Nordostrundingen, Greenland 81 ° 26 ′ 25" N 11 ° 29 ′ 22" W ﻿ / ﻿ 81.44028 ° N 11.48944 ° W ﻿ / 81.44028; - 11.48944 ﻿ (Nordostrundingen). If Greenland is excluded, then the easternmost point is Cape Spear, Newfoundland, Canada 47 ° 31 ′ 25" N 52 ° 37 ′ 10" W ﻿ / ﻿ 47.52361 ° N 52.61944 ° W ﻿ / 47.52361; - 52.61944 ﻿ (Cape Spear). Again, if one uses the technical definition of longitude, it is Pochnoi Point on Semisopochnoi Island, Alaska, 51 ° 57 ′ N 179 ° 52 ′ E ﻿ / ﻿ 51.950 ° N 179.867 ° E ﻿ / 51.950; 179.867 ﻿ (Pochnoi Point) since the state stretches into the Eastern Hemisphere . </Li>

What is the most western point in north america
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