The place that was 'three days from the Black Stone' - Linhir. The grey company arrived at Linhir on the third day after they set out from Erech with the company of oathbreakers.
Some culumalda trees - These trees grow near the Fields of Cormallen
Where Merry saw oak trees off to his right - Merry (and the Rohirrim) was oak trees on their right at Fenmarch
An 'elf-haven' - The elf haven of Edhellond, near Dol Amroth, is the most logical haven for this riddle
The Ethir Anduin - Pelargir
If I have the places right, the path looks like a slightly lopsided square, or a lower case 'e'
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