That could get interesting if someone lives in Kiribati – without leaving their home archipelago, their easternmost could be a few miles west of their westernmost.
Taking the international date line as the maximum you can go east or west…
Northernmost - this rose twisted-stalk from Lake Opeongo, Ontario.
Southernmost - this fur seal from Katiki Point, Aotearoa New Zealand.
Easternmost - this stick insect from Wai-o-tapu, Aotearoa New Zealand
Westernmost- these daffodils from San Fransisco, California.
Easternmost: Beach sunflower in Byron Bay Australia, tied with a gannet, dolphins, and humpback whales that were offshore and may be technically more eastern (on the Australian mainland at least, not going to get much more eastern than this)
Westernmost: Coralline algae (I IDed as common coralline, but probably something else) from the Hole-in-the-Wall arch at Olympic National Park, Washington State
This land is your land, this land is my land,
From Bonavista, to Vancouver Island,
From the Arctic Circle, to the Great lake waters,
This land was made for you and me!
(Canadianized version of the American folk song)
All this to say, I have not been out of my home and native land since joining iNat 4 years ago, but despite my observation map being mostly a long straight line rather than an area, I have gotten observations from 3 out of 4 coasts. (I have gone nowhere near the Arctic Circle).
Western: Stanley Park, Vancouver
Eastern: Bay of Fundy, New Brunswick
Southern: Prince Edward County, Ontario, on Lake Ontario
Northern: Edmonton, Alberta (just this past week)
North AND East: This picture of a conifer in Italy I took when I was there in 2015 and uploaded last year when going through all my photos from that trip to see what I could put up on iNat (slim pickings) https://www.inaturalist.org/observations/195013657
I wonder to what extent this is a biased survey – as in whether widely traveled observers are more likely to respond than the not-so-widely traveled. If all of someone’s observations are within a single country or state, or even within a few adjacent countries or states, they might feel self-conscious about replying.
