Personally, I think this question is a little less interesting if you’re more well-traveled. Especially since east and west are essentially meaningless at that point.
The only reason I responded is because my observations are all from North America.
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Going to stretch it a little there…
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I had the chance of working on an icebreaker so my Northernmost would be this lone Polar Bear on our way to the north Pole : https://www.inaturalist.org/observations/95051576
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Southernmost would be on the same ship, at the Bay of Whales, southernmost sailable point on Earth. Got a few species there but I guess the most iconic is the Emperor Penguin. On one occasion we could see a bunch of juveniles molting on a small iceberg together with some Adélie Penguins : https://www.inaturalist.org/observations/147809606
East and West are tricky, I’m going to play it with the longitude closest to 180.
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Therefore my Easternmost would be the aptly named Eastern Antipodean Albatross soaring next to Moutere Mahue / Antipodes Island (Lon: 178.825118) : https://www.inaturalist.org/observations/197252747
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And finally the Westernmost would be this pod of Arnoux’s Beaked Whales in the Ross Sea (Lon: -179.368179) : https://www.inaturalist.org/observations/149879009
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Definitely motivation to hunt up and add older obs to iNat.
North - Greece chickory (not sure if I could find pictures from John O’Groats)
South - Cape Point, next stop Antarctica. But I can add Cape Agulhas.
East - Mauritius - blue string of stars - choosing wild over horticulture.
West - for now disappointingly only to Langebaan West Coast National Park. But I could add London at least.
Circling my Africa 
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N Melilotus albus White Sweetclover
E Genus Hygrocybe Waxcaps
W Chlosyne coronado Coronado Checkerspot
S Ficus elastica Rubber Plant
Northernmost: https://www.inaturalist.org/observations/142049068
Southernmost: https://www.inaturalist.org/observations/149244235
Easternmost: https://www.inaturalist.org/observations/184262827
Westernmost: https://www.inaturalist.org/observations/92541220
Disappointed I apparently never made any observations in California or L’Agulhas
Even more unique – your observations span the globe, yet you have more in the Southern Hemisphere than the Northern.
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Wow - an interesting question. I’ve been lucky enough to travel a lot so:
My northernmost: https://uk.inaturalist.org/observations/42403006 - Brunnich’s Guillemot in Svalbard - Lat: 80.61 N
My southernmost: https://uk.inaturalist.org/observations/40529529 - Black-necked Swan in Ultima Esperanza, Chile - Lat: 72.52 S
My easternmost: https://uk.inaturalist.org/observations/38031724 - Vanikoro Flycatcher in Fiji - Lon: 179.99 E
My westernmost: https://uk.inaturalist.org/observations/67258969 - Vanikoro Flycatcher in Fiji - Lon: -179.98 W
These last two were quite close together!
Anybody got any observations from Lat 0; Lon 0?
Oh yeah! I guess I did NOT look that close! 
Northernmost: Trifolium repens (White clover) from Oslo, Norway: https://www.inaturalist.org/observations/185452532
Southernmost: Rhinella horribilis (Giant toad) from Dominical, Costa Rica: https://www.inaturalist.org/observations/127384845
Easternmost: Columba livia var. domestica (Feral Pigeon) from Rome, Italy: https://www.inaturalist.org/observations/185281646
Westernmost: Rhinella marina (Cane toad) from Kaanapali, Hawaii: https://www.inaturalist.org/observations/93305670
I live in a country where “Pacific-centric” maps are common:
Using that and my home in South Korea as a baseline …
- North:
Branta canadensis (Canada Goose · 캐나다기러기) from Spokane, WA, USA
Hordeum jubatum (Foxtail Barley) from outside Calgary, Alberta, Canada. - East: Popillia japonica (Japanese Beetle · 왜콩풍뎅이) from Detroit Wayne International Airport, MI, USA.
- South: Dendrocitta formosae (Gray Treepie) from Taipei, Taiwan.
- West: Trachemys scripta elegans (Red-eared Slider · 붉은귀거북) from Tamshui/New Taipei City, Taiwan.
If I use the prime meridian as the center instead:
- East: Limosa lapponica (Bar-tailed Godwit · 큰뒷부리도요) from Pohang, Gyeongsangbuk-do, South Korea.
- West: Ardea herodias (Great Blue Heron) from Olympia, WA, USA.
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I hop between living in Nova Scotia and Tasmania, so E and W based on a “home” of somewhere in the middle -
Northernmost: Black Billed Magpie in Edmonton, AB (Lat: 53)
Southernmost: Cutting Grass in Strathblane, TAS (Lat: -43)
Easternmost: Ladybug Larva in New Glasgow, NS (Lon: -62)
Westernmost: Grey Mangrove outside Adelaide, SA (Lon: 138)
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